How about some items like Reading or Strasburg hopper or box cars?
Maybe a set of four Reading Company passenger cars with a GP-38 diesel engine to round out the set?
Also haven't seen that much in Central of New Jersey!
Maybe a mixed freight set with a Reading SD-45 with some Reading and CNJ freight cars. Reading & CNJ used to work together some as Reading owned the controlling share of CNJ stock for several years, so seeing RDG & CNJ together would be very close to realistic.
Lee F.