British Rail Class 55

British Rail Class 55
Terry Fougler · CC BY-SA 2.0 · source
Name	British Rail Class 55
Powertype	Diesel-electric
Builder	English Electric at Newton-le-Willows
Builddate	1961–1962
Totalproduction	22
Wheelarrangement	Co-Co
Primemover	English Electric 16CSVT
Tractionmotors	English Electric traction motor
Poweroutput	3300 bhp
Operator	British Rail
Disposition	preserved, withdrawn

British Rail Class 55 The British Rail Class 55 was a fleet of high‑speed diesel‑electric locomotives built by English Electric at Newton-le-Willows for British Rail's InterCity express services on the East Coast Main Line between London King's Cross and Edinburgh Waverley via York railway station and Newcastle upon Tyne. Designed during the late British Railways modernisation era, the type combined high power and sustained speed capability, earning strong associations with named trains such as the Flying Scotsman (train) and the Talisman (train). The class influenced later diesel traction policy and remains prominent in heritage railway collections and rail preservation movements.

Design and Development

The design was commissioned by British Railways' Eastern Region to replace steam locomotives like the LNER Class A4 and diesel types such as the Class 40 for expresses on the East Coast Main Line, leading to collaboration between English Electric designers and British Transport Commission engineers. Key engineering decisions were shaped by operational requirements set out by the Modernisation Plan 1955 and consultation with traffic planners from London Midland Region and civil engineers responsible for the Great Northern Railway legacy routes. The two‑engine arrangement using the English Electric 16CSVT prime movers reflected reliability studies informed by earlier prototypes including Deltic development and trials on High Speed Train research. Styling cues and bodywork were influenced by contemporary work at Doncaster Works and the industrial design input from Sir Kenneth Grange-era practices within British Rail design groups.

Technical Specifications

Each locomotive featured twin English Electric 16CSVT V16 diesel engines driving English Electric traction motor sets via AC/DC generator‑traction circuits, delivering a combined output suitable for sustained 100 mph services and rapid acceleration on gradients such as those near Darlington and Northallerton. The Co‑Co wheel arrangement used bogies derived from English Electric practice and incorporated primary and secondary suspension tuned for high‑speed stability on sections governed by the Civil Engineering standards applied across the East Coast Main Line; braking used pneumatic systems compatible with Mark 1 coaching stock. Electrical control employed multiple unit jumpers allowing multiple working with Class 37 and Class 47 types under specific conditions, and auxiliaries included steam heating boilers for vacuum brake coaches before conversion to electric train heating in later years. Weight distribution, fuel capacity, and cooling systems were all optimized to meet Route Availability limits imposed by the British Transport Commission and the Board of Trade certification process.

Operational History

Introduced into service in 1961–1962, the class rapidly took over principal expresses on the East Coast Main Line, operating named services such as the Flying Scotsman (train), the The Elizabethan (train), and the The Northumbrian (train), working from depots including Newark North Gate and Haymarket railway depot. Performance highlights included record‑setting schedules on non‑electrified stretches prior to the extension of 25 kV AC electrification northwards, and intensive summer diagrams during bank holiday peaks and the 1970s oil crisis that emphasized diesel resilience. The electrification extension led to progressive withdrawal in the late 1970s and early 1980s as InterCity 225 and electric traction from British Rail Engineering Limited took over core services, culminating in formal retirement dates influenced by asset management decisions at British Rail and fleet rationalisation studies by National Traction Division.

Liveries and Naming

Originally delivered in British Railways two‑tone green livery and later repainted into Rail Blue with large logo branding during the InterCity era, some examples carried special schemes for promotional events tied to institutions such as British Railways Board campaigns and anniversary workings with guest crews from London Midland Region. Locomotives bore names reflecting regional identity and corporate sponsorship, commemorating places and figures connected to routes: notable names included Deltic-era revivals and monikers celebrating cities like York, Newcastle upon Tyne, and Edinburgh. Nameplates were sometimes loaned to preserved examples or displayed at National Railway Museum exhibits alongside other iconic vehicles like the Mallard.

Preservation and Legacy

Following withdrawal, several locomotives were rescued by preservation groups including Deltic Preservation Society and private owners who operated them on main line running and at events hosted by Railway Touring Company and heritage centres such as the National Railway Museum and North Yorkshire Moors Railway. Preserved examples have hauled railtours for Steam Dreams and appeared at galas alongside preserved A3 Pacific and Beeching era multiple units, forming an enduring part of British rail heritage narratives described in works by historians such as O. S. Nock and commentators associated with Railway Magazine. The class' reputation for high power and distinctive sound influenced later diesel designs by English Electric successors and contributed to preservation‑era lobbying that affected Heritage Railway Association policy on mainline certification and operating standards, ensuring ongoing public engagement through hauled excursions, static displays, and educational programmes.

Category:Diesel locomotives of the United Kingdom