General Motors’ Electro-Motive Division introduced the 3,000-h.p. GP40-2 in 1972, and 1,131 were built by the end of production in late 1978. Chessie System owned the largest fleet with 147 Phase I units that were split between its Baltimore & Ohio and Chesapeake & Ohio companies.
Our samples closely match the GP40-2 dimensions shown in the Simmons-Boardman 1974 Car and Locomotive Cyclopedia. The primary spotting details for Phase I GP40-2s are an engine water-level sight glass on the right rear side of the hood, a large electrical cabinet and straight air duct on the left side, and a lengthened battery compartment.
The different models include the appropriate long hood insert to simulate standard or extended-range dynamic brakes, or a plain roof. Separate parts are provided to detail the pilots with either m.u. hose storage boxes, a rock pilot, or a snowplow, depending upon the prototype. Both pilots are fitted with brake hoses, m.u. cables, and uncoupling levers. Fragile parts like the air horns, cab sunshades, radio antenna, and drop steps are packed separately for user installation.
All of the steps have see-through openings, and each locomotive has individually applied window wipers, metal grab irons, and handrails.
The paint on both of our samples is smooth with clean color breaks, and the lettering is clear and opaque. Colorful EMD builder’s plates are printed beneath the cab.
Mechanism. The GP40-2 is powered with a revised mechanism that’s compatible with the other recent-production Atlas GP38s and GP40s. Its die-cast metal frame now includes an A-frame bracket for a pair of speakers along with spaces for the five-pole can motor, printed-circuit board, turned brass flywheels, and acetal plastic universals and gearboxes.
Excellent early EMD GP or later modified GP truck sideframes are included where appropriate. All of the axles are driven, and all eight drivers pick up electricity.
The RP-25 contour wheelsets match the National Model Railroad Association standards gauge. Both trucks are wired to connectors that plug into the printed-circuit board.
Dual-mode electronics. We reviewed a Gold series model that includes a dual-mode decoder so the locomotive can run on either DCC or DC. A 41-page Diesel Locomotive Operation Manual explains the details of using QSI’s dual-mode system. However, Silver series (DC) models cannot operate in multiple with these models due to the higher starting voltage required by the sound system.
The QSI Quantum sound system is a full-function dual-mode DCC sound decoder. It delivers smooth control as well as excellent diesel sounds. This decoder also responds to QSI’s Quantum Analog Remote Control (QARC). On DC layouts you can operate and program sound functions using a QARC controller (not included) that can be easily added to most DC power packs.
The operating manual explains all of the QSI system’s operating and adjustment procedures. On DCC, the system uses 12 function keys to activate the decoder’s sounds and turn the lights on or off. Individual volume adjustments are available for all of the sounds.
When activated, the system gives verbal confirmations of changes in the DCC configuration variable (CV) settings. In case of a user programming error, a magnetic wand resets everything to the original factory default settings.
The locomotive comes factory programmed for regulated throttle control (RTC) that simulates momentum. This means it responds slowly to changes in the throttle settings. It can be reprogrammed to standard throttle control if you prefer more direct response.
The DC-only units include an NMRA-recommended 8-pin socket for easy conversion to DCC. Units with QSI sound have a different PC board plus a pair of speakers mounted over the rear truck.
Both versions produced identical 4-ounce drawbar pulls equivalent to 56 free-rolling HO freight cars on straight and level track.
Our samples came with standard size Accumate magnetic knuckle couplers. However, the model will accept other brands of magnetic knuckle couplers as well.
This smooth-running, medium-size locomotive is a versatile addi-tion to the Atlas line of HO locomotives. Its superb detailing, great performance, and excellent sounds would make it a standout on any layout.
Price: $149.95 Silver series DC only; $239.95 Gold series with sound and DCC decoder
Manufacturer
Atlas Model Railroad Co.
378 Florence Ave.
Hillside, NJ 07205
Road names (multiple road numbers): Grand Trunk Western; Alaska RR; Atlanta & West Point; Chessie System (B&O and C&O versions); Conrail; CSX; Denver & Rio Grande Western; Detroit, Toledo & Ironton; Florida East Coast; Georgia RR.; Reading; Richmond, Fredericksburg & Potomac; Western Ry. of Alabama; undecorated
Features
Accumate magnetic knuckle couplers (correct height)
Automatic dual-mode sound decoder with dual speakers for use on layouts with DC or Digital Command Control (DCC models)
Die-cast metal underframe
Drawbar pull: 4 ounces
Five-pole skew-wound motor with dual flywheels
Minimum radius: 18″
NMRA-recommended eight-pin DCC plug (DC models)
Painted crew figures
2,600- or 3,600-gallon fuel tank
Weight: 131/2 ounces
