Bavarian B XI DRG Class 36.7–8
	B XI Zwilling (two-cylinder)	B XI Verbund (compound)
Numbering:	1201–1239 from 1926: DRG 36 701–708	1240–1339 from 1926: DRG 36 751–826
Quantity:	39	100
Manufacturer:	Maffei Joseph Anton von Maffei Joseph Anton von Maffei was a German industrialist. Together with Joseph von Baader and Baron Theodor Freiherr von Cramer-Klett , Maffei was one of the three most important railway pioneers in Bavaria.-Early life:Joseph Anton Maffei was born in Munich, the son of an Italian tradesman from Verona...	Maffei Joseph Anton von Maffei Joseph Anton von Maffei was a German industrialist. Together with Joseph von Baader and Baron Theodor Freiherr von Cramer-Klett , Maffei was one of the three most important railway pioneers in Bavaria.-Early life:Joseph Anton Maffei was born in Munich, the son of an Italian tradesman from Verona... , Krauss
Years of Manufacture:	1892–1893	1895–1900
Retirement:	by 1926	by 1931
Wheel arrangement Whyte notation The Whyte notation for classifying steam locomotives by wheel arrangement was devised by Frederick Methvan Whyte and came into use in the early twentieth century encouraged by an editorial in American Engineer and Railroad Journal... :	0-4-0 0-4-0 Under 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...
Axle arrangement UIC classification The UIC classification of locomotive axle arrangements describes the wheel arrangement of locomotives, multiple units and trams. It is set out in the International Union of Railways "Leaflet 650 - Standard designation of axle arrangement on locomotives and multiple-unit sets". It is used in much... :	2'B n2	2'B n2v
Rail gauge Rail gauge Track gauge or rail gauge is the distance between the inner sides of the heads of the two load bearing rails that make up a single railway line. Sixty percent of the world's railways use a standard gauge of . Wider gauges are called broad gauge; smaller gauges, narrow gauge. Break-of-gauge refers... :	1435 mm
Length over buffers Buffer (rail transport) A buffer is a part of the buffers-and-chain coupling system used on the railway systems of many countries, among them most of those in Europe, for attaching railway vehicles to one another.... :	159791 / 168852 mm	16986 mm
Wheel base incl. tender:	128951 / 139702 mm	14095 mm
Service weight:	50.4 t	51.0 / 51.53 t
Adhesive weight Adhesive weight Adhesive weight is the amount of a locomotive's weight that is applied to the driving wheels and so capable of delivering traction. The more weight applied to the driving wheels, the greater the locomotive's ability to haul a load. But if the weight on the driving wheels exceeds the axle load of... :	28.5 t	28.8 / 29.63 t
Axle load Axle load The axle load of a wheeled vehicle is the total weight felt by the roadway for all wheels connected to a given axle. Viewed another way, it is the fraction of total vehicle weight resting on a given axle... :	14.3 t	14.4 / 14.83 t
Top speed:	90 km/h
Driving wheel Driving wheel On a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotive's pistons...  diameter:	1870 mm
Leading wheel Leading wheel The leading wheel or leading axle of a steam locomotive is an unpowered wheel or axle located in front of the driving wheels. The axle or axles of the leading wheels are normally located in a truck...  diameter:	1,006 mm
Valve gear Valve gear The valve gear of a steam engine is the mechanism that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to escape, respectively, at the correct points in the cycle... :	Walschaerts (Heusinger), outside
No. of cylinders:	2
Cylinder bore:	430 mm	455/670 mm
Piston stroke:	610 mm
Boiler Boiler A boiler is a closed vessel in which water or other fluid is heated. The heated or vaporized fluid exits the boiler for use in various processes or heating applications.-Materials:...  overpressure Overpressure The term Overpressure is applied to a pressure difference, relative to a "normal" or "ambient" pressure, in various circumstances:* In engineering: the pressure difference over the wall thickness of a pressure vessel... :	12 kg/cm² = 11.77 bar	13 kg/cm² = 12.75 bar
Grate area:	2.24 m²	2.26 m²
Evaporative heating area:	116.2 m²	116.8 m²
Tender:	bay 3 T 14.5 bay 2'2' T 18	bay 2'2' T 18
Tender service weight:	36.0 / 43.0 t	43.0 t
Water capacity:	14.5 / 18.0 m³	18.0 m³
Fuel capacity:	6.0 / 6.5 t coal	6.5 t coal
1 with bay 3 T 14.5 tender 2 with bay 2'2' T 18 tender 3 from no. 1318

The Class B XI engines of the Royal Bavarian State Railways

Royal Bavarian State Railways

As a nation-state, Germany did not come into being until the creation of the German Empire in 1871 from the various German-speaking states such as Prussia, Bavaria, Saxony, Baden and Württemberg. By then each of the major states had formed its own state railway and these continued to remain...

 (Königlich Bayerische Staatsbahn) were built between 1895 and 1900 by the firm of Maffei

Krauss-Maffei

The Krauss-Maffei Wegmann GmbH & Co KG or simply Krauss-Maffei is an injection molding machine manufacturer and defence company based in Munich, Germany...

 for deployment in Bavaria

Bavaria

Bavaria, formally the Free State of Bavaria is a state of Germany, located in the southeast of Germany. With an area of , it is the largest state by area, forming almost 20% of the total land area of Germany...

. The first delivery comprised 39 vehicles with two-cylinder, saturated steam operation, a further 100 with two-cylinder, compound engines followed in the period up to 1900.

The Deutsche Reichsbahn

Deutsche Reichsbahn-Gesellschaft

The Deutsche Reichsbahn – was the name of the German national railway created from the railways of the individual states of the German Empire following the end of World War I....

 took over 8 engines from the first batch as Class 36.7, with operating numbers 36 701 to 36 708, and 76 of the second batch, with numbers 36 751 to 36 826.

These steam locomotives were equipped with Bavarian 3 T 12, 3 T 14.5 and 2'2' T 18 tenders. These vehicles were the first locos that were give a four-axle tender.