 They were put to work on longer and hillier suburban routes such as the Dandenong, Frankston, Upper Ferntree Gully, Williamstown, Werribee, Lilydale, Darling and Kew railway lines.A total of 58 were built between 1908 and 1913.With electrification of the suburban network already on the drawing board (the first electrified lines opening in 1919), the formula_1 was designed for easy conversion to DD tender engines in the event of electrification making them redundant.