GP28 - MagnumMacKivler/RLCPT2 GitHub Wiki
Illinois Central GP28 9438 at Markham, Illinois, unknown day, October 1979. IC was the largest purchaser of this locomotive type at a whopping 12 units. Chuck Zeiler Photo.
The GP28 was the roots-blown counterpart to the GP35, and was the last offering of the non-turbo 567 engine before its replacement by the 645.
Despite having the same relationship to the GP35 as the GP38 did to the GP40, the GP28 only sold a mere 31 units, a rather token amount compared to the 1334 GP35s produced. This was partly due to the fact that most railroads were more interested in acquiring the most powerful locomotives available at the time, in addition to most rosters already being well filled out by locomotives of similar or identical horsepower, such as (excluding other builders' models) GP7s, GP9s and GP18s. Nevertheless, the GP28 proved that - despite the demand for greater and greater horsepower - there was still a market for a standardized, lower-HP version of the stronger offering, a practice that would continue until the introduction of the 70 series some 30 years later.
PT-Specific Information
| General Info | - |
|---|---|
| Prime Mover | EMD 16-567D1 |
| Horsepower | 1800 |
| Truck Type | EMD "Blomberg" B |
| Axles | 4 |
| Traction Motors | 4 |
| Minimum Weight | 244,800 lbs. |
| Maximum Weight | 270,000 lbs. ⚠ |
| Model Base Speed | 71 MPH |
| Top Speed | 71, 77, or 83 MPH |
| Electrical System | - |
|---|---|
| Generator Max Current | 3000 Amps |
| Max Traction Motor (TM) Current | 1500 Amps |
| Max Continuous TM Current | 1000 Amps |
| Traction Motor Type | DC |
| Factor of Adhesion | 25% |
| Transition Mode | Automatic with Selector |
| Transition Groups | 2, 2, 1, 1 |
| Transition Shunts | 1, 0.75, 1, 0.75 |
| Generator Transition | No |
| Traction Control | APR with sanding |
| Dynamic Braking (DB) Mode (if used) | Mechanical Blowers |
| DB Max Current | 700 Amps |
| DB Max Continuous Current | 700 Amps |
| 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 (1) |
| Compressor CFM | 254 (WBO @ 900 RPM) |
| Main Reservoir Volume | 28.4 Cubic Feet |
Notes:
(1), 6BL or 24RL optional
⚠: Not Verified or Educated Guess