GP7 - MagnumMacKivler/RLCPT2 GitHub Wiki
CB&Q GP7 #250 at Naperville, Illinois on April 19, 1965. Photo by Chuck Zeiler
The GP7 was introduced in 1949 as the first locomotive in EMD's famous General Purpose (GP) series. Learning from their previous offering, the BL2, EMD cut away enough of the carbody to allow full-length walkways on either side, similar to how most switcher locomotives were set up. The GP7 was marketed for road freight service as well as switching, with options for steam generators and gearing up to 89 mph for passenger service. It was succeeded by the GP9 in 1954.
PT-Specific Information
| General Info | - |
|---|---|
| Prime Mover | EMD 16-567B |
| Horsepower | 1500 |
| Truck Type | EMD "Blomberg" B (1) |
| Axles | 4 |
| Traction Motors | 4 |
| Minimum Weight | 240,000 lbs |
| Maximum Weight | 260,000 lbs ⚠ |
| Model Base Speed | 65 MPH |
| Top Speed | 55, 65, 71, 77, 83, or 89 |
| Electrical System | - |
|---|---|
| Generator Max Current | 3000 Amps |
| Max Traction Motor (TM) Current | 1500 Amps |
| Max Continuous TM Current | 825 Amps |
| Traction Motor Type | DC |
| Factor of Adhesion | 25% |
| Transition Mode | Automatic with Selector |
| Transition Groups | 2, 1 |
| Transition Shunts | 1, 1 |
| Generator Transition | No |
| Traction Control | APR |
| Dynamic Braking (DB) Mode (if used) | Mechanical Blowers @ 37.5% |
| DB Max Current | 1500 Amps |
| DB Max Continuous Current | 600 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 | 24-RL (2) |
| Compressor CFM | 178 (Gardner Denver WXE @ 800 RPM) |
| Main Reservoir Volume | 42.9 Cubic Feet (3) |
Notes:
⚠: Not Verified or Educated Guess
(1): GP7s were also built on AAR Type As and EMD Fexicoil B trucks.
(2): Units could also come with 6-BL (US) or 6SL (CAN) brake schedules.
(3): If built with "torpedo tubes" the Main Res Volume would be 35.6 cubic feet.