Trucks: B-B Flexicoil
Engine: 8-567C, 875 hp
Gear ratio: 62:15
Maximum speed: 65 mph
Operating weight (lbs.): 170,640
Tractive effort (lbs.): 32,421
Length: 47′ – 4″
Order no. C-180
| Road no. | Class | Build date | Builder’s no. | Renumbered to | Date | Second renumbering | Date |
| 1570 | GR-9a | Jun 54 | A640 | 1100 | 1956 | 850 | 1957 |
| 1571 | GR-9a | Jun 54 | A611 | 1101 | 1956 | 851 | 1957 |
| 1572 | GR-9a | Jun 54 | A612 | 1102 | 1956 | 852 | 1957 |
| 1573 | GR-9a | Jun 54 | A613 | 1103 | 1956 | 853 | 1957 |
| 1574 | GR-9a | Jun 54 | A614 | 1104 | 1956 | 854 | 1957 |