Externally, the biggest change was the use of the new HT-C three-axle truck in place of the Flexi-coil C of the SD40. The new truck promised greater adhesion, and was longer than the Flexi-coil C, necessitating an increase of the length of the SD40-2s frame to an overall length of 68', 10" over the couplers. This also had the effect of giving the SD40-2 its characteristic long walkway "porches" at each end. Other small external improvements, such as longer battery box compartments, rear overhang on the cab roof, and drip rail over the front cab door, added to the list of external differences between it and the SD40.
Domestic production of the SD40-2 continued until July 1984 making it one of EMD's most popular locomotives of all time. Many remain in service today, both with original owners as well as secondhand operators. Within the last five years, Norfolk Southern and CSX have rebuilt hundreds of SD40-2s to extend their operating life. This will ensure this venerable locomotives presence on U.S. rails for decades to come.
Dimensionally accurate truck centers
Underbody frame rail with separate plumbing and traction motor cables
Sectioned treadplate detail on the walkways
Accurate hood door and long hood detail
Accurately profiled dynamic brake housings
See-through dynamic brake intakes with resistor grid detail
Factory-applied wire grab irons, wire lift rings, windshield wipers, snowplows, horns, coupler cut levers, and trainline hoses
Semi-scale coupler buffer equipped with ScaleTrains.com durable metal semi-scale E Type knuckle couplers
Directional LED headlights
LED lighted number boards
All-wheel electrical pick-up
Motor with 5-pole skew wound armature.
Printing and lettering legible even under magnification
Color matched to Tru-Color Paint colors whenever possible
Operates on Code 70, 83 and 100 rail
Packaging safely stores model
Minimum radius: 18"
Recommended radius: 22"