Pre-Order | Releasing October 2026
Athearn - Item No. ATH-2886
5 out of 5 Customer Rating

HO ATH SD40M-2 Locomotive w/DCC & Sound, MKCX #9046

$230.43
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In the early 1970s, Morrison Knudsen began rebuilding locomotives, including many EMD products, some wearing this attractive paint scheme. Their original shop was in Boise, Idaho.

ATHEARN EMD SD40 DIESEL LOCOMOTIVE PROTOTYPE AND BACKGROUND INFO:

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.

This page is based on the copyrighted Wikipedia article “EMD SD40”; it is used under the Creative Commons Attribution-ShareAlike 3.0 Unported License (CC-BY-SA). You may redistribute it, verbatim or modified, providing that you comply with the terms of the CC-BY-SA.

ATHEARN EMD SD40 DIESEL LOCOMOTIVE FEATURES:

  • LED lighting
  • Photo-etched stainless steel windshield wipers
  • Separately applied wire grab irons and air tanks
  • Curved radiator fan grab iron
  • Coupler cut levers
  • Rubber MU hoses
  • See through cab windows, dynamic brake and radiator fans
  • Fine scale handrails molded in engineering plastic
  • 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 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 with 21-pin NEM connector
  • Improved 5-pole skew wound can motor with flywheels and multi-link drivetrain
  • Wheels with RP25 contours operate on all popular brands of track
  • Highly-detailed, injection molded body
  • Interior plastic blister safely holds the model for convenient storage
  • Minimum radius: 18” — Recommended radius: 22”

SOUND-EQUIPPED MODELS ALSO FEATURE:

  • Onboard DCC decoder with SoundTraxx Econami sound
  • Single cube speaker 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
  • Excellent low-speed operation
  • Program a multiple unit (MU) lashup with lead unit only horn, bell, and lights
  • Many functions can be altered via Configuration Value (CV) changes
  • CV chart included in the box

PRIMED FOR GRIME MODELS FEATURE:

  • Duplicated look and feel of “In Service” equipment
  • Faded base colors matched to the prototype
  • Perfect starting point for adding grime and rust

ROAD NUMBER SPECIFIC FEATURES:

  • #7571: Slotted battery box doors, rear mounted brakewheel
  • #7572: Standard battery box doors, nose mounted ratchet handbrake
  • #7573: Slotted battery box doors, rear mounted brakewheel
  • #6001: Sinclair antenna, without cab air conditioner
  • #6003: Firecracker antenna, cab air conditioner
  • #6005: Firecracker antenna, cab air conditioner
  • #6277: Ex-PC, Built in 1971, with dynamic brake T-Vent

ROAD FEATURES:

  • #6285: Ex-CNJ Exx-BO, Built 1967, without dynamic T-Vent
  • #6287: Ex-CNJ Exx-BO, Built 1967, without dynamic T-Vent
  • #600: Ex-DEEX 003
  • #602: Ex-DEEX 006
  • #9046: Ex-KCS 634, Built in 1971, designated as a SD40M-2
  • #9047: Ex-KCS 614, Built in 1968, designated as a SD40M-2

SP FEATURES:

  • SP Class SD40R - rebuilt in 1980-1981
  • 4,000 gallon fuel tank
  • SP light packages front and rear
  • Large front plow with angled cut levers
  • Nathan P-3 horn
  • Rebuilt “L” shaped front window
  • Extended-range dynamic brakes
  • SP tool box on left hand walkway

WM FEATURES:

  • 4,000-gallon fuel tank
  • Leslie 3-Chime horn
  • Standard EMD plow on each pilot
  • Extended-range dynamic brakes

BN FEATURES:

  • 4,000-gallon fuel tank
  • Leslie 3-Chime horn
  • Standard battery box doors
  • Spare knuckles on rear pilot
  • Standard EMD plow
  • Extended-range dynamic brakes
  • Rear mounted brakewheel

IC FEATURES:

  • 4,000-gallon fuel tank
  • Nathan 5-Chime horn
  • Standard battery box doors
  • Spare knuckles on rear pilot
  • Standard EMD plow
  • Non-dynamic brakes
  • Rear mounted brakewheel

SOU FEATURES:

  • 4,000-gallon fuel tank
  • Hose trays on each pilot
  • Extended-range dynamic brakes
  • Long hood mounted brakewheel
  • Long hood forward operation
  • Leslie-Chime horn on each hood
  • Standard battery box doors

BO FEATURES:

  • 4,000-gallon fuel tank
  • Leslie 3-Chime horn
  • Standard battery box doors
  • Hose trays on each pilot
  • Extended-range dynamic brakes
  • Rear mounted brakewheel

CR FEATURES:

  • 4,000-gallon fuel tank
  • Leslie 3-Chime horn
  • Standard battery box doors
  • Standard EMD plow
  • Extended-range dynamic brakes
  • Rear mounted brakewheel

DEEX FEATURES:

  • 4,000-gallon fuel tank
  • Leslie 3-Chime horn
  • Standard battery box doors
  • Hose trays on each pilot
  • Extended-range dynamic brakes
  • Rear mounted brakewheel

MEC FEATURES:

  • 4,000-gallon fuel tank
  • Leslie 3-Chime horn
  • Standard battery box doors
  • Hose trays on each pilot
  • Extended-range dynamic brakes
  • Rear mounted brakewheel

MKCX FEATURES:

  • 4,000-gallon fuel tank
  • Leslie 3-Chime horn
  • Standard battery box doors
  • Standard EMD plow
  • Extended-range dynamic brakes
  • Rear mounted brakewheel

Product Specs

Axles
6
Coupler Style
McHenry Scale Knuckle
DCC
Ready/21-Pin NEM
Era
1991-2009,2010-Present Day
Full Road Name
Morrison Knudson
Lighting
LED
Minimum Radius
18
Prototype Manufacturer
EMD
Reporting Mark
MKCX
Scale
HO
Sound
Econami
Sub Brand
ATHEARN
Truck Style
Flexicoil-C
Wheel Configuration
C-C