HO Scale: SD40 - DCC & SOUND - Southern Pacific "Roman"


SKU Road Number Qty
ATH86819 8448 Sold Out
ATH86820 8457 Sold Out
ATH86821 8462 Sold Out
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Athearn Ready to Roll HO Scale: SD40 w/DCC & SOUND - SP "Roman"

The EMD SD40-2 is a 3,000-horsepower (2,200 kW) C-C diesel-electric locomotive built by EMD from 1972 to 1989.

The SD40-2 was introduced in January 1972 as part of EMD's Dash 2 series, competing against the GE U30C and the ALCO Century 630. Although higher-horsepower locomotives were available, including EMD's own SD45-2, the reliability and versatility of the 3,000-horsepower SD40-2 made it the best-selling model in EMD's history and the standard of the industry for several decades after its introduction. The SD40-2 was an improvement over the SD40, with modular electronic control systems similar to those of the experimental DDA40X.

Peak production of the SD40-2 was in the mid-1970s. Sales of the SD40-2 began to diminish after 1981 due to the oil crisis, increased competition from GE's Dash-7 series and the introduction of the EMD SD50, which was available concurrently to late SD40-2 production. The last SD40-2 delivered to a United States railroad was built in July 1984, with production continuing for railroads in Canada until 1988, Mexico until February 1986, and Brazil until October 1989.

SD40-2s are still quite usable nearly fifty years after the first SD40 was made, and many SD40s and locomotives from the pre-Dash-2 series (GP/SD 40s, 39s and 38s, and even some SD45s) have been updated to Dash-2 specifications, possibly including downgrading from 20-645E to 16-645E engines, including, certainly, Dash-2 electrical controls, although the pre-Dash-2 frames cannot accommodate the somewhat similar HTC truck in the space allocated to the Flexicoil C truck (the frame is not long enough). Most SD40-2s which remain in service have by now been rebuilt "in-kind" for another 30 to 40 years of service, although a few (under 30) have been rebuilt to incorporate a 12-cylinder EFI-equipped 710G engine.


  • All-new LED lighting
  • Rubber MU hoses for durability
  • Photo-etched stainless steel windshield wipers


  • SP G.R.I.P. SD40R body
  • Front and rear SP style signal lights removed and plated over
  • Illuminated Prime Stratolight beacon (flashes on DCC/sound version)
  • Extended range dynamic brakes with twin T-vents
  • Nathan P-3 air horn
  • Early fans
  • 4000 gal fuel tank
  • Late style 3 position MU hoses
  • Frame mount bell
  • Conductor side SP toolbox and 3 short stanchion handrails
  • Whip antenna


  • Rear mount brake wheel
  • High mount brake cylinders

This unit was SP’s unintentional version of UP’s “Desert Victory" paint scheme. That was because most of the gray paint had peeled off the unit leaving the tan primer visible which looked somewhat like camouflage.


  • Nose mount brake ratchet
  • Hi-Low brake cylinders


  • As delivered SP body
  • Front SP style signal lights
  • Extended range dynamic brakes with rear T-vent
  • Nathan P-3 air horn
  • Early fans
  • 4000 gal fuel tank
  • Early style 4 position MU hoses
  • Roof mount bell
  • Conductor side 3 short stanchion handrails
  • Whip antenna

8411, 8437, & 8451 feature block SP letters on nose and ACI labels which were added to the units starting in the early 1970s.


  • Low 81" nose with brake ratchet
  • Standard range dynamic brake
  • MU catch trays with footboards
  • Low mount brake cylinders
  • Conductor side 3 short stanchion handrails
  • 4000 gal fuel tank
  • Late style 3 position MU hoses
  • Frame mount bell
  • Leslie 5-chime air horn

The Gulf Mobile & Ohio SD40s were found in a variety of service post delivery from EMD. One of the more consistent assignments would be in coal service on the unit Commonweatlth Edison coal train. Although spending only a few years in service on the GM&O before the company merged with Illinois Central, many of these locomotives lasted in their as delivered livery until the mid 1980s.

CWEX Thrall gons: next months announcements including for the first time, the more common, reporting marks only ComEd scheme.


  • Rear hand brake
  • Spare knuckles on rear pilot
  • K5LA horn
  • "Primer"-painted radiator fans to represent replacement parts
  • Bell mounted on side of dynamic brake hatch
  • Flexicoil Hi-brake trucks

One of the more famous CSX locomotive was this former C&O SD40. Affectionately referred by many in the railfan community as the CSX “C&O Heritage" unit, it lasted many years in a ratty faded and patched condition. The original C&O paint survived both the Chessie and CSX eras before finally being retired and repainted into her as delivered C&O scheme in 2017. After being restored to her as delivered road number C&O #7534 ex (CSX #4617) was donated to the C&O Historical Society.


  • Fully assembled and ready-to-run
  • Separately applied wire grab irons
  • Separately applied air tanks
  • Coupler cut levers
  • Rubber MU hoses
  • Photo-etch stainless steel windshield wipers
  • Fine scale handrails molded in engineering plastic
  • Non-sound version features 21-pin NEM DCC plug
  • See-through dynamic brake and radiator fans
  • Curved radiator fan grab iron
  • Exhaust stack
  • Frame mounted bell (unless noted)
  • Detailed 4000 gallon fuel tank (unless different capacity is noted)
  • Flexicoil-C trucks with high or low brake cylinders (per prototype)
  • McHenry scale knuckle spring couplers
  • Highly-detailed, injection molded body featuring new tooling
  • Painted and printed for realistic decoration
  • See through cab windows
  • Bi-directional LED lighting
  • All-wheel drive with precision gears for smooth and quiet operation
  • All-wheel electrical pickup
  • 5-pole motor with flywheels and multi-link drivetrain for trouble-free operation
  • Wheels with RP25 contours operate on all popular brands of track
  • Window packaging for easy viewing
  • Interior plastic blister safely holds the model for convenient storage
  • Minimum radius: 18"
  • Recommended radius: 22"


  • Onnboard Econami sound decoder by Soundtraxx
  • Engine startup sound sequence
  • Dynamic brake sound or Non-Dynamic Straight to idle on F4
  • Extra prime mover and horn sounds exclusive to Athearn version
  • Multiple bell sound files user configurable via Configuration Value (CV)
  • Sound units operate in both DC and DCC
  • Full DCC functions available when operated in DCC mode
  • Engine, horn, and bell sounds work in DC
  • All functions NMRA compatible in DCC mode
  • Excellent Slow speed control
  • Current Keeper ready with on board expansion plug
  • Operating lighting functions with F5 and/or F6
  • Program a multiple unit (MU) lashup with lead unit only horn, bell, and lights
  • Many functions can be altered via CV changes


  • Duplicated look and feel of “In Service" equipment; “Tattered and Torn" just like the real thing
  • Faded base colors matched to the prototype
  • Patches applied and shaped per road number matching each corresponding side to the prototype
  • Perfect starting point for adding grime and rust

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