Talk:British Rail Class 401
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[edit] Voltage
The 2Bil sets (like all pre-1955 SR stock) were built for 660 volts. The uprating of routes from 660V to 750v was done in stages and I don't think the 2Bil sets were ever used on 750V lines. See Railway_electrification_in_Great_Britain#650_V-850_V_DC.2C_Third_rail_.22Southern_Electric.22 Biscuittin (talk) 16:07, 8 March 2008 (UTC)