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HO RTR SD40-2 with DCC & T2 Sound, B&O/Chessie #7608

Item No.
Athearn - ATH72185
Out of Stock | Not Available
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4.5 out of 5 Customer Rating

HO RTR SD40-2 with DCC & T2 Sound, B&O/Chessie #7608

Item No.
Athearn - ATH72185
Product $259.99
Add Ons
Estimated Total: $259.99

HO RTR SD40-2 with DCC & T2 Sound, B&O/Chessie #7608

Item No.
Athearn - ATH72185
4.5 out of 5 Customer Rating
Product $259.99
Add Ons
Estimated Total: $259.99
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Product Details


  • Updated approved colors
  • Chessie rock plows
  • “Mail slot” battery box doors
  • 5-chime horn
  • Art approved by Chessie experts
  • Long hood-mounted bell

The Baltimore and Ohio (now under the unified corporate identity of Chessie System) ordered 20 SD40-2’s. The units were delivered in Jan and Feb of 1977. These units were used all of the system, but were frequent visitors of helper pools in the Appalachian regions. All but one survived into the CSX era.



  • Fully-assembled and ready-to-run
  • DCC-ready features Quick Plug™ plug-and-play technology with 21-pin NEM connector
  • Scaled from prototype resources including drawings, field measurements, photographs, and more
  • Accurately –painted and –printed paint schemes
  • Coupler cut levers
  • Flexible rubber MU hoses for durability
  • Flexible rubber trainline hose
  • See-through cab windows
  • Fine-scale Celcon handrails for scale appearance
  • Photo-etch stainless steel windshield wipers
  • Wire grab irons
  • Detailed fuel tank with fuel fillers, fuel gauges, & breather pipes
  • Separately applied air tanks
  • DCC-ready Non-sound version features 21-pin NEM DCC plug
  • See-through dynamic brake and radiator fans
  • Exhaust stack
  • Frame mounted bell (unless noted)
  • Detailed 4000 gallon fuel tank (unless different capacity is noted)
  • McHenry® scale knuckle couplers - Kadee compatible
  • All-wheel drive with precision gears for smooth & quiet operation
  • All-wheel electrical pickup provides reliable current flow
  • Wheels with RP25 contours operate on all popular brands of track
  • Bi-directional LED lighting for realistic appearance
  • Heavy die-cast frame for greater traction and more pulling power
  • Packaging securely holds model for safe storage
  • Warranty service available
  • Minimum radius: 18” Recommended radius 22”


  • Dual cube speakers
  • Onboard DCC+Sound models have full-feature Tsunami2 sound decoder by SoundTraxx
  • 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
  • Precision slow speed control


The SD40-2 was introduced in January 1972 as part of EMD’s Dash 2 series, responding to competing products from GE and ALCO. 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 like those of the experimental SD45X and DDA40X. The last SD40-2 delivered to a United States railroad was built in July 1984, with production continuing for railroads in Canada until 1988.

Product Specifications

Era 1971-1990, 1991-2009
Prototype Manufacturer EMD
Reporting Mark B&O
Lighting LED
Sound Tsunami2
Scale HO
Axles 6
DCC Equipped