In the late 1970s/early 1980s, many railroads began to replace the existing oil-bath filters on their ?early? GP-38s with easier-to-maintain paper air filter (which became a standard feature on later GP-38 production). Locomotives that received the new air filters could be identified by a modification to the dynamic brake blister, where the portion closest to the cab was ?chopped? to make room for the new equipment. Two common styles of filter box (square and angled) are being produced and will be used as-appropriate per road name. Features Include: -NEW! Modified dynamic brake blister with paper air filter box. (Early Version? GP-38 loco only, Item #s 9119-9140) -4-Function Dual-Mode? Decoder -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 -Snowplow Detail shots: Straight air filter box (pre-production model shown) Angled air filter box (pre-production model shown)