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LNWR Whale Experiment Class
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The London and North Western Railway
London and North Western Railway
The London and North Western Railway was a British railway company between 1846 and 1922. It was created by the merger of three companies – the Grand Junction Railway, the London and Birmingham Railway and the Manchester and Birmingham Railway...

 (LNWR) Experiment Class of was a class of 4-6-0
4-6-0
Under 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...

 steam locomotive designed by George Whale
George Whale
George Whale was a British locomotive engineer who worked for the London and North Western Railway .Whale was born in Bocking, Essex. In 1858 he entered Wolverton Works under James Edward McConnell, and from 1862 under John Ramsbottom. In 1865 he entered the drawing office at Crewe Works, and in...

.

They were an extended version of the Whale's Precursor Class
LNWR Whale Precursor Class
The London and North Western Railway Precursor Class, the second to be known by that name, was a class of 4-4-0 steam locomotives.They were introduced by George Whale in 1904 and 130 examples were built by Crewe Works up to 1907. Their introduction allowed Whale to phase out his predecessor...

 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...

, with slightly smaller driving wheels. The first of the class, 66 Experiment was built in 1905 and a total of 105 were constructed up until 1910. The LNWR reused numbers and names of withdrawn locomotives, with the result that the numbering system was completely haphazard. A 19in Express Goods Class
LNWR 19in Express Goods Class
The London and North Western Railway 19in Express Goods Class, otherwise known as the Experiment Goods Class was a class of 4-6-0 steam locomotives. They were essentially a smaller wheeled version of the Whale's Experiment Class and were an early attempt at a mixed traffic engine.Crewe built 170...

 with smaller driving wheels was also built from 1906. From 1911, a superheated
Superheater
A superheater is a device used to convert saturated steam or wet steam into dry steam used for power generation or processes. There are three types of superheaters namely: radiant, convection, and separately fired...

 version, the Prince of Wales Class
LNWR Prince of Wales Class
The London and North Western Railway Prince of Wales Class was a class of express passenger passenger locomotive. It was in effect, a superheated version of the Experiment Class 4-6-0.They were introduced in 1911 by Charles Bowen-Cooke...

 was built.

In 1915, 1361 Prospero was experimentally rebuilt with four cylinders, Dendy Marshall valve gear and superheated. The conversion was not repeated. Only two other engines were given superheater
Superheater
A superheater is a device used to convert saturated steam or wet steam into dry steam used for power generation or processes. There are three types of superheaters namely: radiant, convection, and separately fired...

s; 2624 Saracen and 1993 (LMS 5472) Richard Moon.

All entered London, Midland and Scottish Railway
London, Midland and Scottish Railway
The London Midland and Scottish Railway was a British railway company. It was formed on 1 January 1923 under the Railways Act of 1921, which required the grouping of over 120 separate railway companies into just four...

 (LMS) stock upon grouping
Railways Act 1921
The Railways Act 1921, also known as the Grouping Act, was an enactment by the British government of David Lloyd George intended to stem the losses being made by many of the country's 120 railway companies, move the railways away from internal competition, and to retain some of the benefits which...

 in 1923. The LMS gave them the power classification 3P. The LMS renumbered them into a more logical series of 5450–5553 according to date of construction. An exception was made for 1361 Prospero which became 5554. Not all however survived long enough to receive their LMS numbers — withdrawals had started in 1925. In 1934 the thirteen then remaining were renumbered with the addition of 20000 to their numbers make room for Black Five
LMS Stanier Class 5 4-6-0
The London Midland and Scottish Railway's Class 5 4-6-0, almost universally known as the Black Five, is a class of steam locomotive. It was introduced by William Stanier in 1934 and 842 were built between then and 1951...

, Patriot
LMS Patriot Class
The Patriot Class was a class of 52 express passenger steam locomotives built for the London Midland and Scottish Railway. The first locomotive of the class was built in 1930 and the last in 1934. All of the Patriot class locomotives were withdrawn from service by 1965...

 and Jubilee
LMS Jubilee Class
The London Midland and Scottish Railway Jubilee Class is a class of steam locomotive designed for mainline passenger work. 191 locomotives were built between 1934 and 1936...

 class locomotives. The final engine was withdrawn the following year and none was preserved.
Brackets indicate numbers allocated by the LMS but not carried by the locomotive.

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