Sydney Trains C set, the first Sydney suburban trains operated by Sydney Trains in New South Wales to be fitted with chopper control, were built as an interim measure due to the lateness of the Tangara program.
They were the first Sydney suburban trains to be fitted with chopper control, which gives the train smoother acceleration. The C sets are a class of electric multiple unit train operated by Sydney Trains in New South Wales, Australia. They were built as an interim measure due to the lateness of the Tangara program. 
