SD39 - MagnumMacKivler/RLCPT2 GitHub Wiki
A former Illinois Terminal (now Norfolk and Western) SD39 sits in a yard in Norfolk, VA. Photo credit Douglas Walker
The SD39 was the first six axle offering which employed the turbocharged V12-645 engine, sold as a fuel-efficient alternative to the SD40. 54 were built between 1968 and 1970 for ATSF (20), SP (26), Illinois Terminal (6), and Minneapolis Northfield and Southern (2).
PT-Specific Information
| General Info | - |
|---|---|
| Prime Mover | EMD 12-645E3 |
| Horsepower | 2300 HP |
| Truck Type | EMD "Flexicoil" C |
| Axles | 6 |
| Traction Motors | 6 |
| Minimum Weight | 356,000 lbs |
| Maximum Weight | 410,000 lbs |
| Model Base Speed | 65 MPH |
| Top Speed | 65, 71, 77, 83, or 89 MPH |
| Electrical System | - |
|---|---|
| Generator Max Current | 4500 |
| Max Traction Motor (TM) Current | 1500 |
| Max Continuous TM Current | 1050 |
| Traction Motor Type | DC |
| Factor of Adhesion | 25% |
| Transition Mode | Automatic with Selector |
| Transition Groups | 2, 2, 1, 1 ⚠ |
| Transition Shunts | 1, 0.75, 1, 0.75 ⚠ |
| Generator Transition | No |
| Traction Control | APR with sanding |
| Dynamic Braking (DB) Mode (if used) | Electrical Blowers (1) |
| DB Max Current | 700 |
| DB Max Continuous Current | 700 |
| 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 | 26L |
| Compressor CFM | 254 (WBO @ 900 RPM) |
| Main Reservoir Volume | 35 Cubic Feet ⚠ |
###Notes:
⚠: Not verified or educated guess
(1): Although listed as Electrical Blowers, they behave like Mechanical Blowers in PT2. All dynamic brake fans use a DC motor powered by tapping the grids, and engine RPM increases when the traction motors need cooling.