Description
The Rivet Counter™ series SD40-2 is the definitive HO Scale model of EMD’s best-selling diesel locomotive. Our model combines smooth operating performance with unparalleled railroad, road number, and era-specific details™. Even though the first SD40-2s were built 50 years ago, many continue in revenue freight service today.
Road Number Specific ScaleTrains
- New road numbers
- Era: mid 1990s to mid 2000s
- BNSF Series 6898 to 6905, 6930 to 6944; ex-ATSF 5170 to 5192, built 11-12/1981
- Fully-assembled
- Multiple road numbers
- Road number-specific repaint variations
- Road number 6932
- Retrofitted cab armrests on cab sides
- Replacement pan-type dynamic brake fans
- Lost-wax brass cast Nathan AirChime K3LAR24 horn with clearance bracket mounted on rear of dynamic brake housing
- Graham-White 975-100 “Twin-Tower” air dryer assembly; retrofitted to rear of air reservoir on fireman’s side
- Graham-White (Prime) brand 975-075 dual air filter set (can style)
- No truck ground lights (prototype not equipped)
- LED-illuminated front deck-mounted ditch lights**
- LED-Illuminated round walkway lights mounted between front sanding valve doors; rectangular walkway lights mounted between rear sanding valve doors and round walkway light, aft of raised walkway duct*
- Directional LED-illuminated headlights
- Printed number boards with separately controlled backlit LED-illumination*
- Vapor Corporation cab roof-mounted HVAC unit
- Front EMD-style low pilot plow with multiple unit (MU) hose doors and grab irons
- 3-hose multiple unit (MU) hose clusters with silver gladhands
- Semi-scale coupler buffer equipped with durable metal semi-scale Type E knuckle couplers, painted a dingy gray/brown color to represent the color of couplers in service
- Front and rear straight uncoupling levers with loop handles; two inner and two outer mounting brackets
- Notched pilot faces without lifting holes or slots
- Pilot face-mounted multiple unit (MU) receptacles
- Dummy multiple-unit (MU) receptacles mounted to pilot faces
- "Tall" stepwells with see-through steps
- Narrow “blunt” front anticlimber
- Handrail set with anticlimber front; outward-facing rear-end rail mounting brackets, and chain
- Rear late “fixed” drop step
- Scale sectioned treadplate detail on walkways
- 88” low short hood with wheel handbrake and round vent on lower right side
- Bolted battery box doors with wide louvers and horizontal stiffener rib
- Late cab sub-base doors with lift-off hinges
- Retrofitted headlight cut into nose; blanked number board light
- Dash-2 cab with welded side window panels
- Rectangular vent on left cab side, towards rear of cab
- Detailed cab interior with separate floor, rear wall, seats, and standard AAR control stand
- Sliding cab side windows
- Tall mirrors mounted fore of cab side windows on both sides of cab
- Standard EMD sunshades with short sunshade tracks
- Large Sinclair Excalibur “ice skate” antenna (communications) and conduit on ground plane mounted on cab roof
- Small Sinclair Excalibur “ice skate” antenna (Locotrol/EOT) and conduit on ground plane on cab roof
- Accurate hood door and long hood detail
- Late electrical cabinet "zig-zag" seam, closer to the rear of the cab
- Late welded ECAFB
- Late inertial air intake grilles with top and bottom drip rail
- “Post-1980” exhaust silencer
- Accurately profiled "post-1980" extended-range (bulged) dynamic brake housing
- See-through dynamic brake intakes with resistor grid detail
- Corrugated radiator intake grilles
- See-through 48” single-speed radiator "Q-Fans” with fan blades visible inside
- Angled radiator fan grab iron
- Underbody frame rail with separate plumbing and traction motor cables
- Detailed HT-C trucks with Hyatt bearing caps, late center axle snubbers, sanding lines and brackets, and D-77 traction motor and air duct details
- Wheel faces painted a dingy gray/brown color to represent the color of wheelsets in service
- Dimensionally accurate truck centers
- GE type speed recorder mounted to first axle on left front
- Rearward-facing handbrake chain mount for HTC trucks
- Short jacking pads (late)
- Spare knuckle boxes mounted to truck side frames
- Aft engineer’s side sidesill notch
- Tab-mount EFCO
- Frame-mounted steel bell
- 4,000-gallon fuel tank with fuel fillers, vertical gauges, round gauges on stand and vertical breather pipe
- Factory-applied wire grab irons, wire lift rings, windshield wipers, trainline hoses with silver gladhands, sand hatch covers, and much more
- Motor with 5-pole skew wound armature
- Dual flywheels
- All-wheel drive
- All-wheel electrical pick-up
- Printing and lettering legible even under magnification
- Operates on Code 70, 83, and 100 rail
- Packaging safely stores the model
- Minimum radius: 18”
- Recommended radius: 22”
DCC & sound equipped locomotives also feature:
- ESU LokSound 5 DCC & Sound decoder with “Full Throttle” functions
- Two (2) cube-type speakers
- Turbocharged EMD 16 Cylinder 645E3 prime mover
- ESU designed “PowerPack” with two super capacitors***
- Operates on both DC and DCC layouts
DC/DCC & sound ready locomotives also feature:
- Operates on DC layouts
- DCC ready with 21-pin connector
* Lighting features operate when using an ESU decoder with appropriate programming while operating using DCC.
** In DC operation, both front ditch lights illuminate; rear ditch lights (if equipped) do not illuminate.
*** Class lights illuminate in white color only in DC operation. Access and change the colors with an appropriately programmed ESU decoder while operating using DCC.
**** “PowerPack” feature is only compatible with appropriately programmed ESU decoders operating on a DCC layout.
In January 1972, the Electro-Motive Division (EMD) of General Motors introduced the first production models of a locomotive design that would prove legendary: the SD40-2. As the flagship of the revolutionary “Dash-2” series, the SD40-2 was developed to improve upon its predecessor, the SD40, by incorporating state-of-the-art electrical and mechanical refinements that enhanced reliability, ease of maintenance, and operational efficiency.
The SD40-2 retained the same sixteen-cylinder, 3,000-horsepower 645E3 turbocharged prime mover as the SD40, ensuring continuity in power and performance. However, the most significant upgrade was the introduction of a modular, solid-state electrical system. This innovation replaced the complex and often troublesome relays of earlier models with removable electronic “cards” housed in a high-voltage cabinet. The modular design simplified troubleshooting, reduced downtime for repairs, and ultimately made the locomotive far more user-friendly for railroad maintenance crews.
Externally, the SD40-2’s most noticeable difference was the adoption of new HT-C three-axle trucks instead of the Flexi-coil Type C trucks used on the SD40. The HT-C trucks provided superior adhesion, which was critical for maintaining traction under heavy loads and improving overall efficiency. However, their longer wheelbase required an increase in the SD40-2’s frame length, resulting in an overall length of 68 feet, 10 inches over the couplers. This extension contributed to the SD40-2’s most recognizable feature: its long walkway “porches” at both ends of the locomotive, which became a defining characteristic of the design.
Additional external refinements further distinguished the SD40-2 from its predecessor. These included longer battery box compartments, a rear overhang on the cab roof, and a drip rail above the front cab door, each of which enhanced operational convenience and durability.
The SD40-2 quickly became one of EMD’s most successful locomotives, with over 3,900 units produced for North American railroads between 1972 and July 1984. Its combination of reliability, ease of maintenance, and adaptability made it a favorite among Class I railroads, regional carriers, and shortline operators alike. Railroads across the United States, Canada, and Mexico employed SD40-2s in a wide range of services, from heavy mainline freight hauling to local switching and work train assignments.
Beyond North America, EMD also developed variants for export, including models for use in South America, Africa, and Australia, where they were adapted to meet specific local operational needs. These locomotives continued to showcase the SD40-2’s reputation for resilience in a variety of environments, from extreme cold to rugged mountain terrain.
Despite the advent of newer, more powerful locomotives in the 1990s and 2000s, the SD40-2 has remained a staple on U.S. rails. Many original units continue to operate today, either with their original owners or on the secondhand market with regional and shortline railroads. Recognizing the enduring value of the SD40-2, Class I railroads such as CSX, Norfolk Southern, and Union Pacific have undertaken extensive rebuild programs to modernize their fleets. These rebuilds often include upgraded control systems, improved emissions compliance, and enhanced fuel efficiency measures, ensuring that the SD40-2 will remain in service well into the future.
With its perfect blend of reliability, versatility, and longevity, the SD40-2 stands as one of the most successful and beloved locomotives in railroad history. Its continued presence on the rails today is a testament to its enduring design and the impact it has had on freight railroading over the past half-century.
