The 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) Princess Royal Class is a class of an express passenger 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...

 designed by William Stanier

William Stanier

Sir William Arthur Stanier, FRS was Chief Mechanical Engineer of the London, Midland and Scottish Railway.- Biography :...

. They were Pacifics (i.e. had a 4-6-2

4-6-2

4-6-2, 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...

 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...

). Thirteen examples were built at Crewe

Crewe

Crewe is a railway town within the unitary authority area of Cheshire East and the ceremonial county of Cheshire, England. According to the 2001 census the urban area had a population of 67,683...

 Works, between 1933 and 1935 and two are preserved.
When originally built, they were used to haul the famous Royal Scot

Royal Scot (train)

The Royal Scot was a British named express passenger train that ran between and , the length of the West Coast Main Line , with previously a portion also going to Edinburgh. For many years it departed from both ends at 10:00...

train between London Euston and Glasgow Central. Two batches of locos were built; a first batch of two, and a second batch of eleven, including a single example of a version using steam turbines instead of cylinders (No.6202

LMS Turbomotive

The Turbomotive was a modified Princess Royal Class steam locomotive designed by William Stanier and built by the London, Midland and Scottish Railway in 1935. It used turbines instead of cylinders...

) – which was in its own, separate class.