A version of the ES 64 U4 was delivered to the Vogtlandbahn of Germany with the designation Class 183. Although the body is the same as any other ES 64 U4 locomotive, it is dual supply and can only operate on the German 15 kV 16.7 Hz AC and the Czech 25 kV 50 Hz AC systems. Even though these locomotives are only equipped to operate under AC power supplies like the DB Class 182, they received a new class designation because they meet the revised EU Driver Protection Standards which required significant structural changes: these include the entrance doors, from one on each side nearer to the middle of the locomotive to two on each side directly into the locomotive cab.