British Rail Class 503
Overview
 
British Rail Class 503 trains were 70 mph (110 km/h) electric multiple unit
Electric multiple unit
An electric multiple unit or EMU is a multiple unit train consisting of self-propelled carriages, using electricity as the motive power. An EMU requires no separate locomotive, as electric traction motors are incorporated within one or a number of the carriages...

s. They were introduced in two batches — in 1938 by 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) with a further batch (built to a similar design) in 1956 by the then nationalised British Railways (BR). They were designed for and operated on the Wirral & Mersey lines
Wirral Line
The Wirral Line is one of the two commuter railway lines operated by Merseyrail that are centred around Merseyside, England, the other being the Northern Line...

 from Liverpool
Liverpool
Liverpool is a city and metropolitan borough of Merseyside, England, along the eastern side of the Mersey Estuary. It was founded as a borough in 1207 and was granted city status in 1880...

 to West Kirby
West Kirby
West Kirby is a town on the north-west corner of the coast of the Wirral Peninsula, England, at the mouth of the River Dee across from the Point of Ayr in North Wales. To the north-east of the town lies Hoylake, with the suburbs of Grange and Newton to the east, and the village of Caldy to the...

, New Brighton
New Brighton, Merseyside
New Brighton is a seaside resort forming part of the town of Wallasey, in the Metropolitan Borough of Wirral, in the metropolitan county of Merseyside, England. It is located at the northeastern tip of the Wirral Peninsula, within the historic county boundaries of Cheshire, and has sandy beaches...

, and Rock Ferry
Rock Ferry
Rock Ferry is an area of Birkenhead on the Wirral Peninsula, England. Administratively it is a ward of the Metropolitan Borough of Wirral. Before local government reorganisation on 1 April 1974, it was part of the county of Cheshire...

. There were few places on their network of closely spaced stations to attain their maximum speed, except for the open section between Moreton
Moreton (Merseyside) railway station
Moreton railway station is situated in Moreton, Wirral, England. It lies on the West Kirby branch of the Wirral Line, part of the Merseyrail network.-Services:...

 and Meols
Meols railway station
Meols railway station is situated in Meols, Wirral, England. It lies on the West Kirby branch of the Wirral Line, part of the Merseyrail network.-History:...

.
The two batches were almost identical, a difference being that the 1938 stock had passenger door-open buttons mounted on the doorleaf itself, whereas on the 1956 the buttons were on the bodyside next to the door.
 
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