Operating Era: 1907-1935. THIS SERIES NOW COMES WITH OUR NEW ONE-PIECE ROOF FRAME. Pennsylvania RR, Pennsylvania Lines, Union Lines. Pennsy installed over 1,600 XLC auto cars between 1906 and 1912. They were 8" taller than the XL but built on the same underframe. All were delivered with metal roofs and all but the last few were built before safety appliances. The double side doors used the same plug door mechanism as the XL; there were no end doors. Like the other cars in the fishbelly side sill family, they were improved with safety appliances in the 'teens and modernized in the 'twenties. The cars ran up to mid-1936.