From 1915 more carriages were constructed as the electrification project gathered pace and requirements were locked in. Further ACP carriages 49–106, and BCP carriages 19–80 were constructed in 1915–1916. However, these did not have the standard carriage bogies; instead they were fitted with plate-framed bogies intended for later fitting of traction motors. The cars also varied in having a well in the roof designed for later provision of electrical equipment—motors, pantographs etc. This gives a rough indication of when the decision was made to proceed with 1500 VDC overhead wiring for Melbourne's electrification, as against earlier proposals for third-rail equipment.