Their electrical system also differed from the BR and NIR versions. The Generator Van contained two engine / generator sets, each supplying 220 / 380 Volts 50 Hz AC to two separate "busses" in the train. The air conditioning loads were divided in half, each half fed from each "bus". In the case of failure of one generator set, the other set automatically supplies both "busses". Air conditioning output power would then be halved, but all other loads including Cooking, Lighting and Battery Charging continue to be supplied. This has remained the model for the electrical power supply on all subsequent IE coaches.