Classic US Heavy Diesel               Premium US Heavy Diesel     
  Engine Sounds EMD 645 & 710, ALCO DL and GE 7FDL 16  EMD 567, 645 & 710, ALCO 244 and GE 7FDL 16
  Turbo  Choice of three  Same as Classic 
  Engine Startup One generic sequence   Separate recordings for each engine 
  Bells Electronic
Electronic, Steel and Bronze 
 Amtrak K5LA, Leslie A200, Nathan K3LA, Wabco E2
Same as Classic plus Nathan M5, Leslie S-3L   
  Guard "All aboard"   "All aboard" and Guard's Whistle 
  Operating Modes A variety of manual and automatic options  Same as Classic