SD40 2 - MagnumMacKivler/RLCPT2 GitHub Wiki
Union Pacific 3134 at speed. —Photo by Elrond Lawrence
The SD40-2 was introduced by EMD in 1972 as part of the "dash 2" line, and was the replacement for the SD40. Featuring a modular electrical system and the new adhesion-boosting HTC truck, the SD40-2 built off of the SD40's strong points while improving upon it's shortcomings, such as it's average electrical reliability. 3,982 SD40-2s were built, making it one of most successful locomotives of all time.
Some SD40-2s were produced with a 116 inch nose instead of the standard 81in. These SD40-2s are sometimes called "snoot" noses, and were ordered for radio equipment for remote control on consists. Such examples were purchased by Union Pacific, Santa Fe, and Southern Pacific (on their SD40T-2s)
BNSF 6856 sits in Great Falls, Montana, delegated as yard and local power. Notice the longer "snoot" nose on this unit. Photo credit Robert Thomson
PT-Specific Information
| General Info | - |
|---|---|
| Prime Mover | EMD 16-645E3C |
| Horsepower | 3000 |
| Truck Type | EMD HTC (1) |
| Axles | 6 |
| Traction Motors | 6 |
| Minimum Weight | 368000 lbs |
| Maximum Weight | 420000 lbs |
| Model Base Speed | 65 MPH |
| Top Speed | 65,70,76,82 MPH |
| Electrical System | - |
|---|---|
| Generator Max Current | 6000 Amps |
| Max Traction Motor (TM) Current | 1500 Amps |
| Max Continuous TM Current | 1050 Amps |
| Traction Motor Type | DC |
| Factor of Adhesion | 27% (1) |
| Transition Mode | Automatic, no selector (2) |
| Transition Groups | 2, 1, 1 ⚠ |
| Transition Shunts | 1, 1, 0.5 ⚠ |
| Generator Transition | No |
| Traction Control | APR + Sand |
| Dynamic Braking (DB) Mode (if used) | Mechanical Blowers |
| DB Max Current | 700 Amps |
| DB Max Continuous Current | 700 Amps |
| Blended Braking | No |
| Miscellaneous | - |
|---|---|
| Head-End Power (HEP) | No |
| HEP Power Consumption | N/A |
| HEP Standby/Run Mode | N/A |
| Load Ramp Speed | 2 Amps/Tick |
| TM Overload Protection | No |
| Starter Mode | Manual Primer, Manual Start |
| Air Brake Schedule | 26-L |
| Compressor CFM | 255.1 (WBO @ 904 RPM) |
| Main Reservoir Volume | 35 Cubic Feet |
Notes
(1): Conrail SD40-2s rode on Flexicoil C trucks. The Flexicoil C has 25% Adhesion.
(2): SD40-2s could optionally be equipped with the older "composite" EMD control stands that gave Automatic Transition with Selector.
⚠: Not Verified or Educated Guess