List of British Rail unbuilt locomotive classes
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There have been a number of TOPS class numbers assigned to proposed locomotives in the UK that have not been built for one reason or another.
Diesel locomotives
Type 1 locomotives
Type 3 locomotives
- Class 38 – Projected classification for new generation of 2000–2250 hp locomotives for Speedlink Distribution in the 1980s.[2] The Class 38 was dropped in favour of the Class 60.
Type 4 locomotives
- Class 41 – The third use of Class 41 was for a proposed class of Class 60 locomotives with 2,500 hp engines in the early 1990s.
- Class 48 – The second use of Class 48 was a proposal for a new class of locomotive for the 1990s, with gearing differences for slower freight work or higher speed loco-hauled for InterCity or parcels trains. The proposal included using proven technology for engines and electrical systems to avoid lengthy introduction and development costs associated with developing new technology.
Type 5 locomotives
- Class 51 – Projected classification for the proposed "Super Deltic" locomotive intended as a follow on from the Class 50 and Class 55.[3][4][5][6]
- 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
Electric locomotives
- Class 88 – The first use of Class 88 was for a proposed electric version of the Class 58,[7] powered through 25 kV AC from overhead wire.
- Class 93 – Proposed electric locomotive for use on the West Coast Main Line as part of the InterCity 250 project.