Posted to the FVM Facebook page over the weekend:
Norfolk Southern as delivered in three road numbers plus the Operation Lifesaver unit. These locos have the late dynamic brakes, twin firecraker antennas and ditch light casting on both ends (non illuminated).
Cotton Belt units with three road numbers. These locos use the early rounded dynamic brakes, long blower duct with appropriate handrails, flush mount brakewheels and numerous top side details (antenna, air conditioner and beacon (non illuminated).
Each of these locos have a MSRP of $130.00 and in most cases are limited to under 100 units per road number (a few more on the Op Lifesaver unit).
Nice to the see the A/C conduit on the roof of these:

