SD24 - MagnumMacKivler/RLCPT2 GitHub Wiki
A former EMD demonstrator, now UP SD24 sits in Los Angeles on hump yard service. Photo credit Joe Blackwell
The SD24 was the first turbocharged 6 axle road switcher offering from EMD, and ran alongside it's first turbocharged four axle cousin, the GP20. The SD24 was the last locomotive to use the former early Special Duty car body; because of this, one of its unique spotting features was a larger turbocharger blower that created a round protrusion on the conductors side.
While it featured more than a four-and-a-half year run as a locomotive offering, only 224 units (including 45 B units) were made for Santa Fe, Union Pacific, Southern Railway, Kennecott Copper, and Chicago Burlington & Quincy.
The SD24 also came in a cabless B unit, solely purchased by the Union Pacific railroad.
An SD24B, purchased by UP only, sits in new paint in Provo, Utah on January 1977; it would be a retired a year later. Photo credit James Belmont
PT-Specific Information
| General Info | - |
|---|---|
| Prime Mover | EMD 16-567D3 |
| Horsepower | 2400 HP |
| Truck Type | EMD "Flexicoil" C |
| Axles | 6 |
| Traction Motors | 6 |
| Minimum Weight | 328,000 lbs |
| Maximum Weight | 390,000 lbs |
| Model Base Speed | 65 MPH |
| Top Speed | 65, 71, 77, 83, or 89 MPH |
| Electrical System | - |
|---|---|
| Generator Max Current | 3000 |
| Max Traction Motor (TM) Current | 1500 |
| Max Continuous TM Current | 950 |
| Traction Motor Type | DC |
| Factor of Adhesion | 25% |
| Transition Mode | Automatic with Selector |
| Transition Groups | 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1 |
| Transition Shunts | 1, 0.94, 0.89, 0.83, 0.78, 0.72, 1, 0.93, 0.86, 0.79, 0.71, 0.64, 0.57, 1, 0.66, 0.33 ⚠ |
| Generator Transition | No |
| Traction Control | APR with sanding |
| Dynamic Braking (DB) Mode (if used) | Mechanical Blowers @ 37.5% |
| 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 | 229.1 (WBO @ 835 RPM) |
| Main Reservoir Volume | 28.9 Cubic Feet (50,000 cu in) |
###Notes:
(1): 24RL or 6BL were optional brake schedules available
⚠: Not verified or educated guess