C855 - MagnumMacKivler/RLCPT2 GitHub Wiki
Image Copyright flickr user Chuck Zeiler
The C855 was designed as a competitor to EMD's DD35 and GE's U50. Boasting 500 extra horsepower, the C855 certainly had an advantage power wise, unfortunately the only three units built were orphans on UP's almost all EMD and GE roster, not helping is the fact these units came delivered with their second electrical cabinet wired backwards, causing quite the show to bystanders. These units very much being orphans only lasted a short life of 7 years, all three being scrapped shortly afterwards.
PT-Specific Information
| General Info | - |
|---|---|
| Prime Mover | ALCO 16-251C 2x |
| Horsepower | 5500 |
| Truck Type | AAR Type B (1) |
| Axles | 8 |
| Traction Motors | 8 |
| Minimum Weight | 528,000 lbs |
| Maximum Weight | 544,000 lbs |
| Model Base Speed | 70 MPH (2) |
| Top Speed | 70, 80, or 86 MPH (2) |
| Electrical System | - |
|---|---|
| Generator Max Current | 7200 Amps |
| Max Traction Motor (TM) Current | 1800 Amps |
| Max Continuous TM Current | 1085 Amps (3) |
| Traction Motor Type | DC |
| Factor of Adhesion | 30% (1) |
| Transition Mode | Automatic with Selector |
| Transition Groups | 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1 |
| Transition Shunts | 1, 0.95, 0.91, 0.87, 0.83, 0.79, 0.75, 0.71, 0.67, 0.63, 0.59, 0.55, 0.51, 0.47, 0.43, 0.39, 1, 0.91, 0.87, 0.79, 0.71, 0.67, 0.63, 0.55, 0.47, 0.43, 0.39 ⚠ |
| Generator Transition | No |
| Traction Control | APR |
| Dynamic Braking (DB) Mode (if used) | Mechanical Blowers @ 50% |
| DB Max Current | 830 Amps |
| DB Max Continuous Current | 830 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 | 26-L |
| Compressor CFM | 472 (Wabco 6CDC @ 1050 RPM) |
| Main Reservoir Volume | 42.9 Cubic Feet |
Notes
⚠: Not Verified or Educated Guess
(1): Late production C855s could be bought with Alco's two-axle Hi-Ad trucks, boosting the adhesion to 34.5%.
(2): Later in production the gearing options changed, making the base speed 67 MPH and the max speeds 67, 75, 79, or 84 MPH
(3): Later Alcos had newer GE 752 traction motors, changing this rating to 1195 Amps.