637G Wheel Tractor-Scraper
- Flywheel Power - Tractor/Scraper
- 373 kw (500 hp) / 211 kW (283 hp)
- Scraper Capacity - Heaped
- 50 yd³
- Top Speed - Loaded
- 33 mile/h
637K Wheel Tractor – Coal Bowl Scraper
- Flywheel Power - Tractor/Scraper
- 425 kW (570 hp)/216 kW (290 hp)
- Scraper Capacity - Heaped
- 50 yd³
- Top Speed - Loaded
- 34.7 mile/h
657 Wheel Tractor-Scraper
- Tractor Engine
- Cat C18
- Flywheel Power - Tractor/Scraper
- 469kW (629 hp) / 353 kW (473 hp)
- Scraper Engine
- Cat C15
657G Wheel Tractor-Scraper
- Flywheel Power - Tractor/Scraper
- 447 kw (600 hp) / 337 kW (451 hp)
- Scraper Capacity - Heaped
- 73 yd³
- Top Speed - Loaded
- 33 mile/h