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British Rail Class AM1
In service
1952-1966
Manufacturer
Metropolitan Cammell
Number built
Four sets
Formation
Driving motor + trailer + driving trailer
Operators
LNWR LMS BR
Specifications
Electric system(s)
6.6 kV 50 Hz OHL
Current collector(s)
Pantograph
Track gauge
4 ft 8+1⁄2 in (1,435 mm) standard gauge
Class AM1 was allocated to the prototype AC electric multiple units, converted from fourth-rail DC electric stock in 1952 and used on the Lancaster/Morecambe/Heysham route. This route had been electrified by the Midland Railway at 6.6 kV, 25 Hz AC. These were withdrawn in 1952 and the service reverted to steam haulage. The line voltage was changed to 6.6 kV at 50 Hz in 1953 and the AM1s were introduced. Thus was a test to see if power could be drawn from the National Grid rather than railway owned power stations. The AM1s were fitted with mercury arc rectifiers but one was later converted to a solid state rectifier as a test. The stock was maintained at Meols Cop works near Southport.[citation needed]
The line was closed to passengers and the stock withdrawn in early 1966. Unlike classes AM2-AM11, which became TOPS Classes 302–311, class AM1 was withdrawn before it could take its place in the system as class 301. However, it was the success of these tests that contributed to the decision to choose 25 kV AC overhead electrification as standard in Great Britain outside the Southern Region.
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