within several years of entering service, however, serious design faults emerged with the rebuilt emus. most notably, their original electrical components, though refurbished, had never been designed to withstand the additional load created by the train's new systems, and as a result the trains suffered frequent failures of their electrical systems. while the emu1200 remain in service, as of 2015 this is by the barest margin; only one of the 9-car sets was operational.