Baltimore and Ohio Railroad locomotives
Encyclopedia
On the Baltimore and Ohio Railroad
, locomotives were always considered of great importance, and the railroad was involved in many experiments and innovations.
is forever associated with the B&O, as the first steam locomotive
built in the United States for an American railroad. It was built strictly as a demonstrator, but it was succeeded by a series of similar locomotives (the "Grasshoppers" and the "Crabs") designed by Ross Winans
, the first head of motive power on the railroad. Early B&O designs were quite unlike those used on other roads, due to in-house design and the emphasis of pulling power. 4-2-0
locomotives from Norris (represented by the "Lafayette" reproduction in the B&O museum's collection) were the anomaly on a railroad which was already building eight-coupled (0-8-0
) locomotives well before the Civil War. By the beginning of the war, new power on the railroad had become more conventional, though many of the older, unconventional designs remained.
Up until 1884 locomotive numbers were reused when locomotives were retired; numbers were not allocated sequentially (unless lower numbers were used up). In 1884, in order to reduce confusion, all locomotives were renumbered to group like locomotives together, and thereafter numbers were retired along with the locomotive to which they referred.
's desire to have a line to New York led to the construction of the Baltimore Belt Line
in order to bring the railroad across Baltimore. The most important feature of this was the Howard Street Tunnel, which began at Camden Station
and headed north to Mount Royal Station
. Objections to use of steam led, in 1895, to the first main line electrification in North America. Trains in one direction were pulled through the tunnel, by a series of electric locomotives that lasted until the end of steam; in the other direction, the train simply drifted down the slope. Dieselization made the electrification unnecessary and it was discontinued in 1952.
s. Economies in haulage could be achieved by reducing the number of locomotives and trains needed, so ever more powerful locomotives were always sought. In 1900 #2400, a 0-6-6-0
design, was introduced, and quickly became known as "Old Maude" after a mule in a cartoon. "Old Maude" boasted an impressive 71,500 pound tractive effort and was a great success. It was the first Mallet in North America. Mallets were built in large numbers for the B&O, culminating in the huge EM-1 2-8-8-4
.
, the motive power department, headed by Col. George H. Emerson, entered on a long series of experiments intended to improve the performance of the steam locomotive. Particular emphasis was placed on the water tube boiler, as opposed to the fire tube boiler used from the earliest days of steam. (In practice, only the firebox used water tubes.) The culmination of these experiments was the duplex #5600
George H. Emerson, the first of its kind. It was to be succeeded by a visionary locomotive of a unique design, of which very little was built before the whole project was cancelled.
Many other trials were conducted of steam locomotive appliances, very few of which had any lasting impact.
At the turn of the century various compound locomotive
s were tried, particularly of the Vauclain
and tandem patterns. As on other roads, they presented maintenance problems, and only the Mallets were repeated. Some engines had scoops to take on water from track pan
s, which were found on the line to New York.
The P-7 "president" engines were originally painted olive green, with the name of a United States president in gold on the cab; later they were painted a dark blue. Certain experimental engines had a British-style firebox door instead of the usual American type.
Finally in 1937 the B&O bought the first multiple unit diesel locomotives to power its passenger trains. And in 1937 they ran the first coast to coast use of diesel electric locomotives. The railroad put an end to the steam locomotive experiments, though wartime pressures would lead to purchase of many other new steam locomotives. Dieselization took many years, and in the meantime a long program of upgrading older locomotives was continued. The P-7 Pacifics were particularly targeted for improvements, culminating in the Cincinnatian, for which four of the engines were upgraded and streamlined to a design by Olive Dennis, who also supervised the refurbishment of the rolling stock.
The B&O did not emphasize standardization, and when road diesels were bought, they were purchased from nearly every manufacturer. By the time of the railroad's purchase in 1963, though, they were well on their way to becoming the all-EMD line which they remained to the end.
In 1954 a group of steam switchers was renumbered to free up numbers in the 600s and 700s for diesels. Then in 1956 all locomotives were renumbered again. All steam locomotives were renumbered below 1000, thus freeing all four digit numbers for use by the growing numbers of diesels.
scheme was devised, based upon wheel arrangement
. Each wheel arrangement was assigned a letter, except for 4-4-0
locomotives, which were subdivided according to cylinder size. When articulated steam locomotives were first introduced, they were assigned a single class ("O"). This proved inadequate almost immediately and a two letter code was used instead, based on treating the locomotive as if it were two engines coupled back-to-back.
Within each letter class, a number was assigned for each successive design. Usually the first class was numbered "1". Locomotives acquired through mergers were renumbered and reclassified to fit into the sequences of numbers and classes.
Lowercase letter suffixes were used to denote successive modifications of a design. The "t" suffix was also used to indicate that the locomotive was assigned an extra large tender. In the twentieth century, such modifications were common, and the pattern of suffixes could become confusing. At one point there was even a class "Qodd" Mikado (2-8-2
).
Diesel locomotives were initially classified according to intended service and model. Eventually this was dropped in favor of using the manufacturer's model designations.
Steam classes were as follows:
Articulated classes:
Electric locomotive classes were as follows:
There was one gasoline-powered locomotive:
Baltimore and Ohio Railroad
The Baltimore and Ohio Railroad was one of the oldest railroads in the United States and the first common carrier railroad. It came into being mostly because the city of Baltimore wanted to compete with the newly constructed Erie Canal and another canal being proposed by Pennsylvania, which...
, locomotives were always considered of great importance, and the railroad was involved in many experiments and innovations.
Early locomotives
The name Tom ThumbTom Thumb (locomotive)
Tom Thumb was the first American-built steam locomotive used on a common-carrier railroad. Designed and built by Peter Cooper in 1830, it was designed to convince owners of the newly formed Baltimore and Ohio Railroad to use steam engines...
is forever associated with the B&O, as the first steam locomotive
Steam locomotive
A steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine...
built in the United States for an American railroad. It was built strictly as a demonstrator, but it was succeeded by a series of similar locomotives (the "Grasshoppers" and the "Crabs") designed by Ross Winans
Ross Winans
Ross Winans was an American inventor, mechanic, and builder of locomotives and railroad machinery. He is also noted for design of pioneering cigar-hulled ships. Winans, one of the United States' first multi-millionaires, was involved in politics and was a vehement states' rights advocate...
, the first head of motive power on the railroad. Early B&O designs were quite unlike those used on other roads, due to in-house design and the emphasis of pulling power. 4-2-0
4-2-0
Under the Whyte notation for the classification of steam locomotives, 4-2-0 represents the wheel arrangement of four leading wheels on two axles, two powered and coupled driving wheels on one axle, and no trailing wheels...
locomotives from Norris (represented by the "Lafayette" reproduction in the B&O museum's collection) were the anomaly on a railroad which was already building eight-coupled (0-8-0
0-8-0
Under the Whyte notation for the classification of steam locomotives, 0-8-0 represents the wheel arrangement of no leading wheels, eight powered and coupled driving wheels on four axles, and no trailing wheels...
) locomotives well before the Civil War. By the beginning of the war, new power on the railroad had become more conventional, though many of the older, unconventional designs remained.
Up until 1884 locomotive numbers were reused when locomotives were retired; numbers were not allocated sequentially (unless lower numbers were used up). In 1884, in order to reduce confusion, all locomotives were renumbered to group like locomotives together, and thereafter numbers were retired along with the locomotive to which they referred.
The Baltimore Belt Line and electrification
John W. GarrettJohn W. Garrett
John Work Garrett was an American banker, philanthropist, and president of the Baltimore and Ohio Railroad ....
's desire to have a line to New York led to the construction of the Baltimore Belt Line
Baltimore Belt Line
The Baltimore Belt Line was constructed by the Baltimore and Ohio Railroad in the 1890s to connect the railroad's newly constructed line to Philadelphia with the rest of the railroad at Baltimore, Maryland. It included the Howard Street Tunnel, the Mount Royal Station and the first mainline...
in order to bring the railroad across Baltimore. The most important feature of this was the Howard Street Tunnel, which began at Camden Station
Camden Station
Camden Station, now also referred to as Camden Yards, is a train station at the intersection of Howard and Camden Streets in Baltimore, Maryland, served by MARC commuter rail service and local Light Rail trains. It is adjacent to Oriole Park at Camden Yards...
and headed north to Mount Royal Station
Mount Royal Station
The Mount Royal Station and Trainshed was the Baltimore and Ohio Railroad's third train station in Baltimore, Maryland, at the north end of the Baltimore Belt Line's Howard Street tunnel in the fashionable Bolton Hill neighborhood...
. Objections to use of steam led, in 1895, to the first main line electrification in North America. Trains in one direction were pulled through the tunnel, by a series of electric locomotives that lasted until the end of steam; in the other direction, the train simply drifted down the slope. Dieselization made the electrification unnecessary and it was discontinued in 1952.
"Old Maude"
Another innovation was the introduction of Mallet locomotiveMallet locomotive
The Mallet Locomotive is a type of articulated locomotive, invented by a Swiss engineer named Anatole Mallet ....
s. Economies in haulage could be achieved by reducing the number of locomotives and trains needed, so ever more powerful locomotives were always sought. In 1900 #2400, a 0-6-6-0
0-6-6-0
In Whyte notation, a 0-6-6-0 is a railroad steam locomotive that has two articulated sections, each with six coupled driving wheels, without any leading wheels or trailing wheels.-Equivalent classifications:Other equivalent classifications are:...
design, was introduced, and quickly became known as "Old Maude" after a mule in a cartoon. "Old Maude" boasted an impressive 71,500 pound tractive effort and was a great success. It was the first Mallet in North America. Mallets were built in large numbers for the B&O, culminating in the huge EM-1 2-8-8-4
2-8-8-4
Under the Whyte notation for the classification of steam locomotives, a 2-8-8-4 is a steam locomotive with two leading wheels, two sets of eight driving wheels, and a four-wheel trailing truck.Other equivalent classifications are:...
.
"Uncle Dan" and Colonel Emerson
In the presidency of Daniel WillardDaniel Willard
Daniel Willard was a railroad executive best known as the president of the Baltimore and Ohio Railroad from 1910 to 1941. He served on or headed several government railroad commissions in World War I and appeared on the cover of Time magazine in 1932 due to his part in negotiating wage cuts in the...
, the motive power department, headed by Col. George H. Emerson, entered on a long series of experiments intended to improve the performance of the steam locomotive. Particular emphasis was placed on the water tube boiler, as opposed to the fire tube boiler used from the earliest days of steam. (In practice, only the firebox used water tubes.) The culmination of these experiments was the duplex #5600
Baltimore and Ohio Class N-1
The Baltimore and Ohio Railroad's sole Class N-1 steam locomotive, #5600 George H. Emerson, was the first duplex locomotive and the first 4-4-4-4 locomotive ever built. It was designed and built by the railroad's own shops in 1937. The rear set of cylinders were placed beside the firebox. This...
George H. Emerson, the first of its kind. It was to be succeeded by a visionary locomotive of a unique design, of which very little was built before the whole project was cancelled.
Many other trials were conducted of steam locomotive appliances, very few of which had any lasting impact.
At the turn of the century various compound locomotive
Compound locomotive
A compound engine unit is a type of steam engine where steam is expanded in two or more stages.A typical arrangement for a compound engine is that the steam is first expanded in a high-pressure cylinder, then having given up heat and losing pressure, it exhausts directly into one or more larger...
s were tried, particularly of the Vauclain
Vauclain compound
The Vauclain compound was a type of compound steam locomotive that was briefly popular around 1900. Developed at the Baldwin Locomotive Works, it featured two pistons moving in parallel, driving a common crosshead and controlled by a common valve gear using a single, complex piston...
and tandem patterns. As on other roads, they presented maintenance problems, and only the Mallets were repeated. Some engines had scoops to take on water from track pan
Track pan
A track pan or water trough is a device to enable a steam railway locomotive to replenish its water supply while in motion...
s, which were found on the line to New York.
The P-7 "president" engines were originally painted olive green, with the name of a United States president in gold on the cab; later they were painted a dark blue. Certain experimental engines had a British-style firebox door instead of the usual American type.
Diesels
Other trials, it can be said, changed the face of railroading. In 1925 the B&O was one of the buyers of the first model of diesel locomotive, of which CNJ 1000 was the first example. These were used as yard engines in areas where smoke abatement led to restrictions or bans on the use of steam. In 1935 a single unit mainline diesel-electric engine (#50) was constructed; this was eventually transferred to the Chicago and Alton Railroad, an affiliated line.Finally in 1937 the B&O bought the first multiple unit diesel locomotives to power its passenger trains. And in 1937 they ran the first coast to coast use of diesel electric locomotives. The railroad put an end to the steam locomotive experiments, though wartime pressures would lead to purchase of many other new steam locomotives. Dieselization took many years, and in the meantime a long program of upgrading older locomotives was continued. The P-7 Pacifics were particularly targeted for improvements, culminating in the Cincinnatian, for which four of the engines were upgraded and streamlined to a design by Olive Dennis, who also supervised the refurbishment of the rolling stock.
The B&O did not emphasize standardization, and when road diesels were bought, they were purchased from nearly every manufacturer. By the time of the railroad's purchase in 1963, though, they were well on their way to becoming the all-EMD line which they remained to the end.
In 1954 a group of steam switchers was renumbered to free up numbers in the 600s and 700s for diesels. Then in 1956 all locomotives were renumbered again. All steam locomotives were renumbered below 1000, thus freeing all four digit numbers for use by the growing numbers of diesels.
Locomotive Classification
Before the Civil War, the B&O organized its locomotives into four classes, based upon relative power. After the war this was felt to be inadequate, and a classificationClass (locomotive)
Class refers to a group of locomotives built to a common design for a single railroad. Often members of a particular class had detail variations between individual examples, and these could lead to subclasses. Sometimes technical alterations move a locomotive from one class to another...
scheme was devised, based upon wheel arrangement
Wheel arrangement
In rail transport, a wheel arrangement is a system of classifying the way in which wheels are distributed beneath a locomotive.. Several notations exist to describe the wheel assemblies of a locomotive by type, position, and connections, with the adopted notations varying by country...
. Each wheel arrangement was assigned a letter, except for 4-4-0
4-4-0
Under the Whyte notation for the classification of steam locomotives, 4-4-0 represents the wheel arrangement of four leading wheels on two axles , four powered and coupled driving wheels on two axles, and no trailing wheels...
locomotives, which were subdivided according to cylinder size. When articulated steam locomotives were first introduced, they were assigned a single class ("O"). This proved inadequate almost immediately and a two letter code was used instead, based on treating the locomotive as if it were two engines coupled back-to-back.
Within each letter class, a number was assigned for each successive design. Usually the first class was numbered "1". Locomotives acquired through mergers were renumbered and reclassified to fit into the sequences of numbers and classes.
Lowercase letter suffixes were used to denote successive modifications of a design. The "t" suffix was also used to indicate that the locomotive was assigned an extra large tender. In the twentieth century, such modifications were common, and the pattern of suffixes could become confusing. At one point there was even a class "Qodd" Mikado (2-8-2
2-8-2
Under the Whyte notation for the classification of steam locomotives, 2-8-2 represents the wheel arrangement of two leading wheels on one axle , eight powered and coupled driving wheels on four axles, and two trailing wheels on one axle...
).
Diesel locomotives were initially classified according to intended service and model. Eventually this was dropped in favor of using the manufacturer's model designations.
Steam classes were as follows:
- A initially 4-6-04-6-0Under the Whyte notation for the classification of steam locomotives, 4-6-0 represents the wheel arrangement of four leading wheels on two axles in a leading truck, six powered and coupled driving wheels on three axles, and no trailing wheels. This wheel arrangement became the second-most popular...
camelback locomotiveCamelback locomotiveA camelback locomotive is a type of steam locomotive with the driving cab placed in the middle, astride the boiler...
s; later 4-4-24-4-2 (locomotive)Under the Whyte notation for the classification of steam locomotives, 4-4-2 represents the wheel arrangement of four leading wheels on two axles , four powered and coupled driving wheels on two axles, and two trailing wheels on one axle... - B 4-6-04-6-0Under the Whyte notation for the classification of steam locomotives, 4-6-0 represents the wheel arrangement of four leading wheels on two axles in a leading truck, six powered and coupled driving wheels on three axles, and no trailing wheels. This wheel arrangement became the second-most popular...
- C 0-4-00-4-0Under the Whyte notation for the classification of steam locomotives, 0-4-0 represents one of the simplest possible types, that with two axles and four coupled wheels, all of which are driven...
- D 0-6-00-6-0Under the Whyte notation for the classification of steam locomotives, 0-6-0 represents the wheel arrangement of no leading wheels, six powered and coupled driving wheels on three axles, and no trailing wheels...
- E 2-8-02-8-0Under the Whyte notation for the classification of steam locomotives, 2-8-0 represents the wheel arrangement of two leading wheels on one axle , eight powered and coupled driving wheels on four axles, and no trailing wheels...
- F 4-4-04-4-0Under the Whyte notation for the classification of steam locomotives, 4-4-0 represents the wheel arrangement of four leading wheels on two axles , four powered and coupled driving wheels on two axles, and no trailing wheels...
with 16" dia. cylinders or less - G 4-4-04-4-0Under the Whyte notation for the classification of steam locomotives, 4-4-0 represents the wheel arrangement of four leading wheels on two axles , four powered and coupled driving wheels on two axles, and no trailing wheels...
with 17" dia. cylinders - H 4-4-04-4-0Under the Whyte notation for the classification of steam locomotives, 4-4-0 represents the wheel arrangement of four leading wheels on two axles , four powered and coupled driving wheels on two axles, and no trailing wheels...
with 18" dia. cylinders - I 4-4-04-4-0Under the Whyte notation for the classification of steam locomotives, 4-4-0 represents the wheel arrangement of four leading wheels on two axles , four powered and coupled driving wheels on two axles, and no trailing wheels...
with 19" dia. cylinders - J 4-4-04-4-0Under the Whyte notation for the classification of steam locomotives, 4-4-0 represents the wheel arrangement of four leading wheels on two axles , four powered and coupled driving wheels on two axles, and no trailing wheels...
and 4-4-44-4-4Under the Whyte notation for the classification of steam locomotives, 4-4-4 represents the wheel arrangement of four leading wheels on two axles, four powered and coupled driving wheels on two axles, and four trailing wheels on two axles. In the United States, this arrangement was named the...
with Wootten fireboxWootten fireboxThe Wootten firebox is a type of firebox used on steam locomotives. The firebox was very wide to allow combustion of anthracite coal waste, known as Culm. Its size necessitated unusual placement of the crew, examples being camelback locomotives...
es - K 2-6-02-6-0Under the Whyte notation for the classification of steam locomotives, 2-6-0 represents the wheel arrangement of two leading wheels on one axle, usually in a leading truck, six powered and coupled driving wheels on three axles, and no trailing wheels. This arrangement is commonly called a Mogul...
- L 0-8-00-8-0Under the Whyte notation for the classification of steam locomotives, 0-8-0 represents the wheel arrangement of no leading wheels, eight powered and coupled driving wheels on four axles, and no trailing wheels...
- M 4-4-04-4-0Under the Whyte notation for the classification of steam locomotives, 4-4-0 represents the wheel arrangement of four leading wheels on two axles , four powered and coupled driving wheels on two axles, and no trailing wheels...
with 20" dia. cylinders - N 4-4-4-44-4-4-4A 4-4-4-4 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, has a four-wheel leading truck, two sets of four driving wheels, and a four-wheel trailing truck.Other equivalent classifications are:...
— One locomotive: #5600 George H. EmersonBaltimore and Ohio Class N-1The Baltimore and Ohio Railroad's sole Class N-1 steam locomotive, #5600 George H. Emerson, was the first duplex locomotive and the first 4-4-4-4 locomotive ever built. It was designed and built by the railroad's own shops in 1937. The rear set of cylinders were placed beside the firebox. This... - O originally for any Mallet type; replaced by two letter code
- P 4-6-24-6-24-6-2, in the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of four leading wheels on two axles , six powered and coupled driving wheels on three axles, and two trailing wheels on one axle .These locomotives are also known as Pacifics...
- Q 2-8-22-8-2Under the Whyte notation for the classification of steam locomotives, 2-8-2 represents the wheel arrangement of two leading wheels on one axle , eight powered and coupled driving wheels on four axles, and two trailing wheels on one axle...
- R 0-4-40-4-4Under the Whyte notation for the classification of steam locomotives, 0-4-4 represents the wheel arrangement of no leading wheels, four powered and coupled driving wheels on two axles, and four trailing wheels on two axles...
Forney locomotiveForney locomotiveThe Forney is a type of tank locomotive patented by Matthias N. Forney between 1861 and 1864. Forney locomotives include the following characteristics:* An 0-4-4T wheel arrangement, that is four driving wheels followed by a truck with four wheels....
s - S 2-10-22-10-2Under the Whyte notation for the classification of steam locomotives, 2-10-2 represents the wheel arrangement of two leading wheels on one axle, usually in a leading truck, ten powered and coupled driving wheels on five axles, and two trailing wheels on one axle, usually in a trailing truck...
– Two classes S and S-1Baltimore and Ohio Class SBaltimore and Ohio Class S comprised two classes of 2-10-2 locomotives.The S class proper were 31 locomotives built in 1914 by Baldwin Locomotive Works and numbered 6000–6030. The S-1 class comprised 125 locomotives numbered 6100–6224... - T 4-8-24-8-2Under the Whyte notation for the classification of steam locomotives, 4-8-2 represents the wheel arrangement of four leading wheels on two axles , eight powered and coupled driving wheels on four axles, and two trailing wheels on one axle...
- U 0-10-00-10-0Under the Whyte notation for the classification of steam locomotives, 0-10-0 represents the wheel arrangement of no leading wheels, ten powered and coupled driving wheels on five axles, and no trailing wheels...
- V 4-6-44-6-4Under the Whyte notation for the classification of steam locomotives, 4-6-4 represents the wheel arrangement of four leading wheels on two axles , six powered and coupled driving wheels on three axles, and four trailing wheels on two axles .Other equivalent classifications are:UIC classification:...
– Four locomotives in four classes: V-1, V-2Baltimore and Ohio No. 2 Lord BaltimoreThe Baltimore and Ohio Railroad's sole class V-2 4-6-4 steam locomotive, No. 2 Lord Baltimore, was constructed by the railroad's own shops in 1935. It was constructed to haul a new, lightweight train, the Royal Blue, between New York City and Washington, DC. Later on that year it was sent to the...
, V-3, and V-4. - W 4-2-2-2-2-4 geared locomotive (never built)
- Y 2-10-02-10-0Under the Whyte notation for the classification of steam locomotives, 2-10-0 represents the wheel arrangement of two leading wheels on one axle, ten powered and coupled driving wheels on five axles, and no trailing wheels...
Articulated classes:
- DD 0-6-6-00-6-6-0In Whyte notation, a 0-6-6-0 is a railroad steam locomotive that has two articulated sections, each with six coupled driving wheels, without any leading wheels or trailing wheels.-Equivalent classifications:Other equivalent classifications are:...
- EE 2-8-8-22-8-8-2.A 2-8-8-2, in the Whyte notation for describing steam locomotive wheel arrangements, is an articulated locomotive with a two-wheel leading truck, two sets of eight driving wheels, and a two-wheel trailing truck. The equivalent UIC classification is, refined to Mallet locomotives, D1...
- EL 2-8-8-02-8-8-0In the Whyte notation for the classification of steam locomotives by wheel arrangement, a 2-8-8-0 is a locomotive with a two-wheel leading truck, two sets of eight driving wheels, and no trailing truck.-Equivalent classifications:...
- EM 2-8-8-42-8-8-4Under the Whyte notation for the classification of steam locomotives, a 2-8-8-4 is a steam locomotive with two leading wheels, two sets of eight driving wheels, and a four-wheel trailing truck.Other equivalent classifications are:...
- KB 2-6-6-42-6-6-4In the Whyte notation for the classification of steam locomotive wheel arrangement, a 2-6-6-4 is a locomotive with a two-wheel leading truck, two sets of six driving wheels, and a four-wheel trailing truck...
- KK 2-6-6-22-6-6-2In Whyte notation, 2-6-6-2 refers to a railroad steam locomotive that has two leading wheels followed by six coupled driving wheels, a second set of six coupled driving wheels, and two trailing wheels...
- KL 2-6-8-02-6-8-0A 2-6-8-0 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, has two leading wheels, a set of six driving wheels, a set of eight driving wheels, and no trailing wheels...
- LL 0-8-8-00-8-8-0In the Whyte notation for classifying the wheel arrangement of steam locomotives, an 0-8-8-0 is a locomotive with two sets of eight driving wheels and neither leading wheels nor trailing wheels...
- MK 4-4-6-2
Electric locomotive classes were as follows:
- LE-1 the original Bo+Bo motors
- LE-2 Bo-Bo motors intended for freight haulage
- OE-1, OE-2, 'OE-3 Bo-Bo
- CE-1 Bo switcher
There was one gasoline-powered locomotive:
- CG 0-4-00-4-0Under the Whyte notation for the classification of steam locomotives, 0-4-0 represents one of the simplest possible types, that with two axles and four coupled wheels, all of which are driven...
Notable classes and locomotives
- Tom ThumbTom Thumb (locomotive)Tom Thumb was the first American-built steam locomotive used on a common-carrier railroad. Designed and built by Peter Cooper in 1830, it was designed to convince owners of the newly formed Baltimore and Ohio Railroad to use steam engines...
was the first steam locomotive used in the United States - 2400 Old Maude (Class O) was the first Mallet in the United States
- 5600 George H. EmersonBaltimore and Ohio Class N-1The Baltimore and Ohio Railroad's sole Class N-1 steam locomotive, #5600 George H. Emerson, was the first duplex locomotive and the first 4-4-4-4 locomotive ever built. It was designed and built by the railroad's own shops in 1937. The rear set of cylinders were placed beside the firebox. This...
(Class N-1) was the first duplex locomotive
- Class Q-3 was the USRA Light MikadoUSRA Light MikadoThe USRA Light Mikado was a USRA standard class of steam locomotive designed under the control of the United States Railroad Administration, the nationalized railroad system in the United States during World War I...
including the very first built (#4500) - Class P-7 was the "president" series of pacifics (4-6-24-6-24-6-2, in the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of four leading wheels on two axles , six powered and coupled driving wheels on three axles, and two trailing wheels on one axle .These locomotives are also known as Pacifics...
) - Class C-16 was the "Little JoeLittle Joe (Baltimore and Ohio locomotive)The C-16 class switchers were the last 0-4-0 steam locomotives built for the Baltimore and Ohio Railroad. They were assigned to the Baltimore, Maryland "Pratt Street Line" along the Inner Harbor, and to the Philadelphia, Pennsylvania waterfront trackage. Initially constructed as saddle tank...
" or "Dockside" switchers - Class LE-1 locomotives were the first mainline electric locomotives
- The class EM-1 simple articulated locomotives were the largest locomotives run on the B&O
- William MasonWilliam Mason (locomotive)"William Mason" is a 4-4-0 steam locomotive currently in operation at the Baltimore and Ohio Railroad Museum in Baltimore, Maryland, USA. It was built for the Baltimore and Ohio Railroad, carrying that railroad's number 25...
is currently the oldest operating example of the 4-4-04-4-0Under the Whyte notation for the classification of steam locomotives, 4-4-0 represents the wheel arrangement of four leading wheels on two axles , four powered and coupled driving wheels on two axles, and no trailing wheels...
type locomotive in the United States.