LT 2500 - MagnumMacKivler/RLCPT2 GitHub Wiki
Image Copyright flickr user Center for Railroad Photography & Art
The LT-2500 (Spec A-3177, and rostered as the LS-25 or LS-25M on PRR lists depending on the presence of MU) was a center-cab transfer locomotive of similar design to the double-ended Baldwin transfer diesel. Taking the in-house designed and catalogued LT-2400 as a base (which was itself a development of their uncatalogued LT-2200), PRR put out a specification for a 2500 horsepower unit of which only Lima managed to achieve (Baldwin, surprisingly, wasn't able to meet the requirement - falling short with their DT-6-6-2000.) making the LS-25 the single most powerful switcher in the world at it's introduction. Further, the LS-25 was the last locomotive to leave the Lima-Hamilton shops before Baldwin took over. None survived to see Penn Central use. Curiously, two of such units were equipped with dynamic brakes, the only two Lima locomotives to ever be such equipped.
PT-Specific Information
| General Info | - |
|---|---|
| Prime Mover | Hamilton T-89-SA x2 |
| Horsepower | 2500 |
| Truck Type | Commonwealth C (1) |
| Axles | 6 |
| Traction Motors | 6 (1) |
| Minimum Weight | 360,000 lbs |
| Maximum Weight | 380,000 lbs ⚠ |
| Model Base Speed | 65 MPH |
| Top Speed | 65 MPH, 75 MPH(1) |
| Electrical System | - |
|---|---|
| Generator Max Current | 12000 Amps |
| Max Traction Motor (TM) Current | 2000 Amps |
| Max Continuous TM Current | 950 Amps (1) |
| Traction Motor Type | DC |
| Factor of Adhesion | 25% |
| Transition Mode | Automatic, no Selector |
| Transition Groups | 1, 1, 1, 1 (1) |
| Transition Shunts | 1, 0.80, 0.60, 0.40 |
| Generator Transition | No |
| Traction Control | None |
| Dynamic Braking (DB) Mode (if used) | 2 (Electrically-Driven Blowers) |
| DB Max Current | 1050 ⚠ |
| DB Max Continuous Current | 800 ⚠ |
| Blended Braking | No |
| Miscellaneous | - |
|---|---|
| Head-End Power (HEP) | No |
| HEP Power Consumption | N/A |
| HEP Standby/Run Mode | N/A |
| Load Ramp Speed | 6 Amps/Tick ⚠ |
| TM Overload Protection | No |
| Starter Mode | Latched Primer, Manual Start |
| Air Brake Schedule | 24-RL |
| Compressor CFM | 292.6 x2 (Gardner Denver WXO @ 950 RPM) |
| Main Reservoir Volume | 54 Cubic Feet ⚠ |
Notes
⚠: Not Verified or Educated Guess
(1): An A1A option was offered, this changes the Trucks to Commonwealth A1A, Traction Motors to 4, Transition Groups to 2,2,2. Further, using A1A changes maximum continuous amperage to 1050. Since both trucks are centrally blown with the same size bolster, the three-motor truck has less air CFM per motor and sees a lower continuous rating as a result. Further, the increased amp capacity allowed the truck to run at a higher speed - changing both Maximum and Top Speeds to 75 MPH.