In 1966 EMD introduced a new line of locomotives based on the 16-cylinder 645-series prime mover. The “40-series” included a six-axle and four-axle model, the latter being the GP40. A total of 1,145 units were produced between 1966 and 1972. These turbocharged 3,000hp locomotives were used primarily in road freight service. The GP40 was a versatile locomotive that could be found across the US hauling drag freights over mountain passes and leading high-speed intermodal trains across flat terrain. Three rooftop radiator fans at the rear of the long hood differentiate a GP40 from its lower horsepower counterpart, the GP38, which has two fans at this location.
Concurrent with GP40 production, EMD offered a lower horsepower, non-turbocharged locomotive based on the same 645-series prime mover. The four-axle GP38 was rated at 2,000 hp and had the advantage of costing less than the GP40. A total of 727 units were produced between 1966 and 1971 when the model was superseded. The wheelbase of the GP38 was identical to that of the GP40. Both units shared the same EMD road-switcher style body that was introduced with the GP35 in 1963. A desire for standardization caused the GP38 to share the same wheelbase, frame and many external components as the GP40. The GP38 was purchased by large and small roads alike. It was routinely found in local and road freight service throughout the US. Many GP38s and 40s are still in service today.
Options on the Atlas GP38 and GP40 models include a long hood with or without dynamic brakes and an underframe with 2,600 or 3,600 gallon fuel tanks.
• Golden-white LEDs • Realistic die-cast underframe
• Factory-equipped with AccuMate® knuckle couplers • Directional lighting
• Detailed cab interior with crew • Movable drop steps
• Walkway safety tread • Coupler cut bars
• Multiple unit hoses and trainline hoses • Snowplow
• Separately-installed scale windshield wipers, metal grab irons and fine scale handrails
• Five-pole skewed armature motor with dual flywheels for optimum performance at all speeds
Additional feature parts included but not installed (GP-40):
• Electrical cabinet air filter box (ECAFB)
• Two engine compartment roof vents which were added by many railroads sometime after delivery
DCC Operation FEATURES:
• Supports all DCC-programming modes • Flexible mapping of function keys F0 to F28.
• A total of six DCC function outputs are available
• Follows all NMRA DCC standards and recommended practices.
Analog (DC) Operation FEATURES:
• The LokSound Select Dual-Mode decoder allows your Atlas Gold Series locomotive to be used on DC
as well as on DCC layouts.
• Please note that the Atlas Quantum Engineer will NOT operate an Atlas Gold Series locomotive
equipped with a LokSound Select decoder on an analog (DC) layout. However, the sound and lighting
functions of the LokSound Select decoder in the Atlas Gold Series GP38/40 locomotive can be
controlled by an easy-to-use basic DCC system
• Also note that on a DC-powered layout, a DCC and sound equipped locomotive (such as the Atlas Gold
Series GP38/40) CANNOT be consisted with another locomotive that does not also have both DCC and
sound. (This statement does NOT apply to DCC-equipped locomotives operating on a DCC layout.)