According to Joe AKA silverliner_2 on the boards, the Nine Comet cars are set to arrive on SEPTA’s property by this weekend. These cars will be put into service by the October schedule change. Before then, these cars will undergo a minor overhaul. Their car numbers are, Comet I cabs 5121, 5132 and trailers 5727, 5728, 5735, 5741, 5742, and 5747. The extra car (#5118) will only serve a parts supply.
http://philadelphiatransitforums.cjb.net/topic/7027413/1/#new