U25B - MagnumMacKivler/RLCPT2 GitHub Wiki
A Penn Central U25B in Maybrook, NY in 1970. Photo credit Marty Bernard, Flickr
after finally completing the divorce paperwork with alco, ge officially entered the locomotive market with the u25b. hilariously, it managed to be both one of the shortest and the most powerful single motor diesel locomotive in the us when it was introduced. while it sold Pretty Okay For the Time, and scared The Ever Loving Shit Out Of Alco, ge ran into a small design flaw with the u25b: it wasnt powered by a 567. as with most universals, the majority had a very uneventful 13 year lifetime and were promptly scrapped (conveniently at the same time as when ge recommended all universals to be rebuilt with new gensets.) it was superceded by the literally identical u28b when the fdl was fully potty trained.
One of UP's super early ex-demo U25B's, equipped with a high short hood. Note the ladder style steps. One demonstrator (that also went to UP) had the same ladder steps but with a low nose. Photo credit Chuck Zeiler, Flickr
PT-Specific Information
| General Info | - |
|---|---|
| Prime Mover | GE 7FDL-16A |
| Horsepower | 2500 for traction |
| Truck Type | AAR Type B (1) |
| Axles | 4 |
| Traction Motors | 4 |
| Minimum Weight | 260,000 lbs (2) |
| Maximum Weight | 272,000 lbs ⚠ |
| Model Base Speed | 70 MPH |
| Top Speed | 70, 80, or 85 ⚠ |
| 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 | Automatic w/ Selector |
| Transition Groups | 2, 2, 1, 1 |
| Transition Shunts | 1, 0.55, 1, 0.55 |
| Generator Transition | No |
| Traction Control | APR |
| Dynamic Braking (DB) Mode (if used) | Mechanical Blowers (0) |
| DB Max Current | 740 Amps ⚠ |
| DB Max Continuous Current | 740 Amps ⚠ |
| Blended Braking | No |
| Miscellaneous | - |
|---|---|
| Head-End Power (HEP) | No |
| HEP Power Consumption | N/A |
| HEP Standby/Run Mode | N/A |
| Load Ramp Speed | 8 Amps/Tick ⚠ |
| TM Overload Protection | No |
| Starter Mode | Latched Prime, Manual Start |
| Air Brake Schedule | 26-L |
| Compressor CFM | 307cfm (Wabco 3CDCBL @ 1000 RPM) |
| Main Reservoir Volume | 32.4 Cubic Feet |
Notes
-1: Blomberg-Bs could be used from EMD trade-ins. Factor Of Adhesion is the same.
-2: Phase 2 units were lighter than phase 1 units by some five tons. From 1962, units were available at 250,000-252,000 lbs minimum weight.