SDL39 - MagnumMacKivler/RLCPT2 GitHub Wiki
A Milwaukee Road SDL39 sits outside of a roundhouse in Aberdeen, South Dakota. Photo credit Jeff van Cleve.
The SDL39 was a unique version of the SD39 that was slimmed down for weight purposes. This locomotive rides on modified EMD Flexicoil C trucks, usually used for units that are exported outside of North America, to allow it to fit on a smaller GP39 carbody while accommodating a fuel tank. Because of this squish for room, there is not enough for a middle traction motor, and thus the wheel configuration is considered A-1-A.
The SDL39 was solely requested from, and purchased by the Milwaukee Road railroad (MILW). 10 units were made, with 5 made in March-April 1969, and then another 5 in November of 1972. These locomotives, after the Milwaukee Road was purchased by the Soo Line, were then later sold to the Wisconsin Central, which then sold them to Ferrocarril del Pacifico (Chile) after WC was bought by Canadian National. Of the original 10, 9 are still running while one was wrecked then scrapped by MILW in 1983.
PT-Specific Information
| General Info | - |
|---|---|
| Prime Mover | EMD 12-645E3 |
| Horsepower | 2300 |
| Truck Type | EMD "Flexicoil" C (foreign export truck with offset axles) |
| Axles | 6 |
| Traction Motors | 4 |
| Minimum Weight | 250,000 lbs |
| Maximum Weight | 270,000 lbs ⚠ |
| Model Base Speed | 65 MPH |
| Top Speed | 65, 71, 77, 83, 90, or 96 MPH |
| Electrical System | - |
|---|---|
| Generator Max Current | 3000 Amps |
| Max Traction Motor (TM) Current | 1500 Amps |
| Max Continuous TM Current | 1050 Amps |
| Traction Motor Type | DC |
| Factor of Adhesion | 25% |
| Transition Mode | Fully Automatic with Selector |
| Transition Groups | 2, 2, 1, 1 ⚠ |
| Transition Shunts | 1, 0.75, 1 ,0.75 ⚠ |
| 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 | 26L |
| Compressor CFM | 254 (WBO @ 900 RPM) |
| Main Reservoir Volume | 33.8 Cubic Feet |
Notes
(⚠): Not Verified or Educated guess