The
1955 diesel locomotive classes are given in brackets where applicable. A large number of different shunter types were purchased by
British Rail and its predecessors, many of which were withdrawn prior to the introduction of
TOPS. The tables below attempt to list the different types and the
different classifications used to describe them as clearly as possible:
Small shunters: under 300 hp Shunter classes are listed by 1955 class, which puts TOPS classes in ascending order, and generally puts 1948 and 1962 classes in ascending order. Unclassed shunters are placed at the start of the table; TOPS class 07 has been placed so its 1962 class is in the logical place. • Relation between TOPS, 1948, 1955 and 1962 classes, and 1948, 1957 and TOPS numbers:
Large shunters: 300–799 hp • Relation between TOPS, 1948, 1955 and 1962 classes, and 1948, 1957 and TOPS numbers:
Type 1 locomotives: 800 – 1,000 hp • Relation between TOPS, 1948, 1955 and 1962 classes, and 1948, 1957 and TOPS numbers (unless otherwise given):
Type 2 locomotives: 1,001 – 1,499 hp Locomotive class are listed by TOPS class. Locomotives for TOPS classes 24 and 26 have their original sub-classes shown, as each wholly comprised locomotives from a distinct 1962 class. Class 21 (II) has sub-classes shown as these are superficially similar but mechanically different types grouped into a single class. • Relation between TOPS, 1948, 1955 and 1962 classes, and 1948, 1957 and TOPS numbers (unless otherwise given):
Type 3 locomotives: 1,500–1,999 hp • Relation between TOPS, 1955 and 1962 classes, and pre-TOPS and TOPS numbers (unless otherwise given):
Type 4 locomotives: 2,000–2,999 hp Type 5 locomotives: over 3,000 hp ==Electric locomotives==