Era: 1975 to present

Upgraded tooling
Celcon handrails
Separately applied wire grab irons
Window glazing
Separately applied air tanks
Operating headlights utilizing microbulbs
DCC ready using Quick Plug technology
Prototype specific details, such as:
Nose lengths
Many headlight options
Grilles & Fans
Fuel tank (plastic)
Dynamic Brakes
Battery Access Doors
Electrical Cabinet / Air Filter Box
Exhaust stack
Air horn & Bell
Truck sideframes
Pilot details (anticlimbers and snow plow)