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HO SD40 Locomotive, Western Maryland #7448

Item No. ATH87231
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5 out of 5 Customer Rating

HO SD40 Locomotive, Western Maryland #7448

Item No. ATH87231
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Product Details


  • Medium plows on both ends
  • Bell mounted on left side of long hood
  • Extra ballast on right side walkway
  • Early cut levers and handrails
  • Flexicoil trucks with high brake cylinders

There were 12 of these 3000hp, six-axle units on the WM. The first seven units, 7470-7474 and 7495-7496, were delivered in Speedlettering, with the last five delivered in Circus. The units were equipped with 26L brake gear and brake current limiting on the dynamic brakes. As of the Spring of 1996, all twelve of the ex-WM SD40 units remined in service. All but 4 were working for CSXT. Unit 4618 remained in the Chessie paint scheme, with the WM logo under the cab.

Stakem, Patrick H, and Stakem, Patrick E. “Western Maryland Diesel Locomotives”. TLC Publishing Inc, 1997.


  • Bi-directional LED lighting
  • Coupler Cut Levers
  • Rubber MU hoses
  • Exhaust stack
  • Curved radiator fan grab iron
  • Fine scale handrails
  • Photo-etched stainless steel windshield wipers
  • Separately applied wire grab irons
  • See-through dynamic brake, radiator fans and cab windows
  • Frame mounted bell (unless noted)
  • Detailed 4,000 gallon fuel tank (unless different capacity is noted)
  • Flexicoil-C trucks with high or low brake cylinders (per prototype)
  • Separately applied air tanks
  • McHenry® scale knuckle couplers - Kadee® compatible
  • All-wheel drive with precision gears for smooth & quiet operation
  • All-wheel electrical pickup provides reliable current flow
  • DCC-ready features Quick Plug™ plug-and-play technology
  • Improved 5-pole skew wound can motor with flywheels and multi-link drivetrain for trouble-free operation
  • Non-sound version features 21-pin NEM DCC plug
  • Wheels with RP25 contours operate on all popular brands of track
  • Highly-detailed, injection molded body
  • Painted and printed for realistic decoration
  • Fully assembled and ready-to-run
  • Window packaging for easy viewing
  • Interior plastic blister safely holds the model for convenient storage
  • Minimum radius: 18” — Recommended radius: 22”

    • Newly designed can motor is more powerful and quieter than before
    • DCC & sound models feature Tsunami2 sound with dual cube speakers
    • LED lighting for long life and reliable operation


    • Onboard Tsunami2 DCC/Sound decoder
    • Dual cube speakers for optimal sound quality
    • Sound units operate in both DC and DCC
    • Engine, horn, and bell sounds work in DC
    • Some functions are limited in DC
    • All functions NMRA compatible in DCC mode
    • Operating lighting functions with F5 and/or F6 (Flashing ditch lights, beacon, etc.)
    • Excellent low-speed operation
    • Program a multiple unit (MU) lash up with lead unit only horn, bell, and lights
    • Many functions can be altered via Configuration Value (CV) changes
    • CV chart included in the box


    In 1966, EMD updated its locomotive catalog with entirely new models, all powered by the new 645 diesel engine. The SD40 had 3,000 hp from a turbocharged V16. 856 examples of this locomotive model were built for American railroads, 330 were built for Canadian railroads, and 72 were built for Mexican railroads.

Product Specifications

DCC Ready/21-Pin NEM
Reporting Mark WM
Scale HO
Era 1941-1970, 1971-1990
Prototype Manufacturer EMD
Axles 6
Lighting LED
Sound Ready