| 1 | A | B | C | D | E | F |
| --- | --- | --- | --- | --- | --- | --- |
| 2 | British Rail Class 57 - Fleet details |  |  |  |  |  |
| 3 | Subclass | No. Built | No. Range | Operators | Loco Nos. | Total |
| 4 | 57/0 | 12 | 57001-012 | Direct Rail Services | 57002, 57003, 57004, 57007, 57008, 57009, 57010, 57011, 57012 | 9 |
| 5 | 57/0 | 12 | 57001-012 | West Coast Railways | 57001, 57005, 57006 | 3 |
| 6 | 57/3 | 16 | 57301-316 | Direct Rail Services | 57301, 57302, 57303, 57304, 57306, 57307, 57308, 57309, 57310, 57311 | 10 |
| 7 | 57/3 | 16 | 57301-316 | Rail Operations Group | 57305, 57312 | 2 |
| 8 | 57/3 | 16 | 57301-316 | West Coast Railways | 57313, 57314, 57315, 57316 | 4 |
| 9 | 57/6 | 5 | 57601-605 | Great Western Railway | 57602, 57603, 57604, 57605 | 4 |
| 10 | 57/6 | 5 | 57601-605 | West Coast Railways | 57601 | 1 |

Question: Who operated the sub-classes of 57313-316, and how many sub-classes were there?
Answer: All three 57 sub-classes of 57313-316 were operated by West Coast Railways.