British Rail Class 57
Fleet details

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