Their electrical system differed from the BR and NIR versions. The generator van contained two engine/generator sets, each supplying 220/380 V 50 Hz AC to two separate electrical buses in the train. The air conditioning loads were divided in half, each half fed from a separate bus. In the case of failure of one generator set, the other set automatically supplies both buses. Air conditioning output power would then be halved, but all other loads including cooking, lighting and battery charging would continue to be supplied. This later remained the model for the electrical power supply on all subsequent IE coaches.