RSD 4 - MagnumMacKivler/RLCPT2 GitHub Wiki
Image Copyright flickr user Marty Bernard
The RSD-4, introduced in early 1951, was ALCO's first 6-motor road switcher offering since the RSD-1 and the predecessor to the RSD-5. Essentially an RS-3 with two extra motors, the RSD-4 was quite durable and had it's kinks worked out once you put an Alco designed turbo on it. Though it had very low production numbers (mostly due to it quickly being superseded by the RSD-5 for reasons unknown), one remains in preservation on static display.
PT-Specific Information
| General Info | - |
|---|---|
| Prime Mover | ALCO 12-244D (1) |
| Horsepower | 1600 |
| Truck Type | Alco Trimount C |
| Axles | 6 |
| Traction Motors | 6 |
| Minimum Weight | 270,000 lbs |
| Maximum Weight | 360,000 lbs |
| Model Base Speed | 60 MPH |
| Top Speed | 60 MPH |
| Electrical System | - |
|---|---|
| Generator Max Current | 3000 Amps |
| Max Traction Motor (TM) Current | 1500 Amps |
| Max Continuous TM Current | 1085 Amps |
| Traction Motor Type | DC |
| Factor of Adhesion | 25% |
| Transition Mode | Manual with Selector (2) |
| Transition Groups | 3, 2, 2 |
| Transition Shunts | 1, 1, 0.42 |
| Generator Transition | No |
| Traction Control | APR |
| Dynamic Braking (DB) Mode (if used) | Electrical Blowers |
| DB Max Current | 1500 Amps |
| DB Max Continuous Current | 640 Amps |
| Blended Braking | No |
| Miscellaneous | - |
|---|---|
| Head-End Power (HEP) | No |
| HEP Power Consumption | N/A |
| HEP Standby/Run Mode | N/A |
| Load Ramp Speed | 10 Amps/Tick |
| TM Overload Protection | No |
| Starter Mode | Latched Primer, Manual Start |
| Air Brake Schedule | 6-SL (3) |
| Compressor CFM | 225 (Wabco 3CDC @ 1000 RPM) (4) |
| Main Reservoir Volume | 35 Cubic Feet |
Notes
⚠: Not Verified or Educated Guess
(1): Later units were built with a 12-244G, 12-244H, or rebuilt with a 12-250.
(2): "Automatic with Selector" was optional.
(3): 24-RL was optional.
(4): 307 and 450 CFM compressors were available.