Trucks: B-B Blomberg
Engine: No engine
Gear ratio:
Maximum speed:
Operating weight: 258,000 lbs.
Tractive effort: 49,000 lbs.
Length:
Booster units with no engine, require an electrical connection with a locomotive to provide electrical power to the traction motors. Mated with 7600 series GP40-3 locomotives.
| Road no. | Class | Previous road no. | Notes / disposition |
| 600 | GY-00a | 503, 263:1 | |
| 601 | GY-00a | 516, 276:1 |