Features Include:
-Realistic die-cast underframe
- Five-pole skewed armature motor with dual flywheels for optimum performance at all speeds
- Directional lighting
- Factory-equipped with AccuMate knuckle couplers
- Detailed cab interior with crew
- Separately-installed scale windshield wipers, metal grab irons and fine scale handrails - Movable drop steps - Walkway safety tread - Coupler cut bars
- Multiple unit hoses and trainline hoses

Additional feature parts included but not installed: - Snowplow - Electrical cabinet air filter box (ECAFB) - Two engine compartment roof vents which were added by many railroads sometime after delivery (GP-40 only)

The GP-38 and GP-40 locomotives are available in dynamic or non-dynamic brake versions, with either a 2600 or 3600 gallon fuel tank as appropriate by railroad.