What is British Rail Class AM1?
'''Class AM1''' was allocated to the prototype AC [[electric multiple unit]]s, converted from fourth-rail DC electric stock in 1952 and used on the [[Lancaster, Lancashire|Lancaster]]/[[Morecambe]]/[[Heysham]] route. This route had been electrified by the [[Midland Railway]] at 6.6 kV, 25 Hz AC, but the frequency was changed to 50 Hz in 1953 to test the prototype AM1 stock. {{British Rail EMU}} {{transport-stub}} [[Category:British Rail electric multiple units|AM1]]