List of British Rail unbuilt locomotive classes

There have been a number of TOPS

TOPS

Total Operations Processing System, or TOPS, is a computer system for managing the locomotives and rolling stock owned by a rail system...

class numbers assigned to proposed locomotives that have not been built for one reason or another.

Class 18 - A proposed new Type 1 locomotive proposed in the mid 1980s. No prototype model was ever produced.

Class 38 - Projected classification for new generation of Type 3 freight locomotives in the 1980s. The Class 38 was dropped in favour of the Class 60
British Rail Class 60
The British Rail Class 60 is a class of Co-Co heavy freight diesel-electric locomotives built by Brush Traction. They are nicknamed Tugs by Rail Enthusiasts.-History:...

.

Class 41 - The second use of Class 41 was for a proposed class of Class 60
British Rail Class 60
The British Rail Class 60 is a class of Co-Co heavy freight diesel-electric locomotives built by Brush Traction. They are nicknamed Tugs by Rail Enthusiasts.-History:...

locomotives with 2,500 hp engines in the early 1990s.
Class 48 - The second use of Class 48 was for a new class of freight locomotive in the mid 1980s.

Class 51 - Projected classification for the proposed "Super Deltic" locomotive intended as a follow on from the Class 50
British Rail Class 50
The British Rail Class 50 is a diesel locomotive built from 1967-68 by English Electric at their Vulcan Foundry Works in Newton-le-Willows. Fifty of these locomotives were built to haul express passenger trains on the, then non-electrified, section of the West Coast Main Line between Crewe,...

and Class 55
British Rail Class 55
The British Rail Class 55 is a class of diesel locomotive built in 1961 and 1962 by English Electric. They were designed for the high-speed express passenger services on the East Coast Main Line between and Edinburgh. They gained the name "Deltic" from the prototype locomotive, DP1 Deltic, which...

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Class 62 - Projected classification for proposed Type 5 coal train locomotives in the early 1990s.
Class 65 - Projected classification for proposed 4,000 hp freight working locomotive intended for liner trains.

Electro-diesel locomotives

Class 88 - Proposed electric version of the Class 58
British Rail Class 58
The British Rail Class 58 is a class of Co-Co diesel locomotive designed for heavy freight. Introduced in 1983, they followed American practice of modularisation. From new they were painted in grey Railfreight Sector livery, instead of BR blue...

, powered through 25 kV AC from overhead wire.
Class 93
British Rail Class 93
British Rail Class 93 is the traction classification assigned to the electric locomotives that were to enter service as part of British Rail's InterCity 250 project on the West Coast Main Line ....

- Proposed electric locomotive for use on the West Coast Main Line
West Coast Main Line
The West Coast Main Line is the busiest mixed-traffic railway route in Britain, being the country's most important rail backbone in terms of population served. Fast, long-distance inter-city passenger services are provided between London, the West Midlands, the North West, North Wales and the...

as part of the InterCity 250
InterCity 250
InterCity 250 was the name of a proposed rolling stock, track and signalling upgrade project on the West Coast Main Line by British Rail in the early 1990s. The InterCity 250 train would have consisted of a Class 93 electric locomotive, nine Mark 5 coaches and a Mark 5 Driving Van Trailer...

project.

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