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| BR Class 455 | |
|---|---|
| Name | BR Class 455 |
| Caption | British Rail Class 455 at a suburban station |
| Manufacturer | BREL, Brush Traction, ABB Group |
| Built | 1972–1984 |
| In service | 1983–present |
| Number built | 505 |
| Formation | 4 cars per unit |
| Operator | South Western Railway, Southern, London Overground, Transport for London |
| Carbody | Steel |
| Max speed | 75 mph (121 km/h) |
| Traction | DC electric |
BR Class 455 is a family of British electric multiple units introduced in the early 1980s for suburban passenger services in the United Kingdom. Designed as part of the 1970s–1980s rolling stock modernisation programmes, the units served densely populated commuter routes radiating from London and other major urban centres. They became a mainstay on third-rail electrified lines operated by a succession of companies including British Rail and later privatised operators.
The Class 455 programme emerged from British Rail engineering priorities influenced by procurement decisions at British Rail and industrial design practices at BREL and British Steel Corporation. Development involved collaboration between BR Engineering teams, contractors such as Brush Traction and suppliers including GEC and Allied Signal for electrical equipment, reflecting contemporaneous projects like the BR Classes 313–317 and lessons from the Austrian Federal Railways EMU designs. Intended to replace ageing units on the Southern Region, the conceptual work considered depot arrangements at Clapham Junction, fleet commonality with Class 508 and interoperability with third-rail systems used on routes to Waterloo, Victoria Station, and London Bridge.
Each four-car unit featured welded steel bodyshells built to standards comparable to contemporary BR Mk2 coaching stock, with pneumatic braking systems derived from designs used on British Rail Class 313 and resistive DC traction equipment similar to that fitted on Class 421 units. The electrical architecture operated from 750 V DC third-rail collection, utilising shoegear compatible with infrastructure at locations such as Surrey, Hampshire, and Kent lines. Bogie arrangements, axle loadings, and suspension parameters followed engineering practices established in works at Doncaster Works and Crewe Works, while heating, ventilation, and auxiliary systems referenced standards applied in Network SouthEast fleets.
Introduced into revenue service during the 1980s, these units were deployed primarily on suburban commuter services into London Waterloo and other metropolitan termini, operating alongside fleets from operators including South West Trains and later South Western Railway. Over decades the units ran on routes to stations such as Guildford, Woking, Sutton, and Hampton Court, being scheduled in diagrams coordinated with signalling centres at Clapham Junction and maintenance cycles at depots like Farnham and Slade Green. The fleet was affected by the privatisation of British Rail in the 1990s, transferring to multiple franchises and being reallocated by companies like Southern and Transport for London as route patterns and franchise boundaries evolved.
Manufactured in several batches, the family included subclasses produced at different times with distinctions paralleling subclass variations seen in BR Class 321 and Class 450 programmes. Subclasses differed in interior layout, door configurations, and traction control details, reflecting orders placed by regional management boards and franchise holders such as Network SouthEast and Connex South Eastern during successive procurement rounds. Collocation and compatibility considerations with units like Class 456 influenced coupling codes and multiple-working arrangements used in commuter formations.
Throughout their operational life, many units underwent interior and systems refurbishments overseen by companies including Bombardier Transportation and depot teams at Eastleigh Works. Upgrades ranged from seating and passenger information systems to traction and braking component overhauls derived from supply chains involving Siemens and ABB Group. Accessibility modifications followed regulatory frameworks influenced by legislation such as the Disability Discrimination Act 1995 and later accessibility standards enforced by bodies like Office of Rail and Road and Department for Transport programmes, with retrofit work carried out during scheduled maintenance at depots including Fratton and Farnham.
Units from the fleet featured in several operational incidents recorded by the Rail Accident Investigation Branch and earlier by Her Majesty's Railway Inspectorate, ranging from minor collisions in station throat areas at locations including Wimbledon and Clapham Junction to derailments and trackside asset strikes investigated in formal reports. Some incidents prompted technical modifications and timetable adjustments overseen by infrastructure owner Network Rail and operator safety teams, influencing subsequent risk assessments and depot maintenance regimes.
From the 2000s onward, progressive withdrawal began as newer fleets such as Class 707, Class 707 (Adtranz), and Class 701 units were introduced under franchise renewal programmes involving operators like South Western Railway and Southern. Preservation efforts saw a small number of vehicles and driving cabs rescued by heritage groups active at sites including National Railway Museum-affiliated societies and regional preservation centres in Heritage Railway collections. Withdrawn units were either scrapped by contractors in facilities near Swansea and Sheffield or repurposed for departmental use by organisations such as Network Rail.
Category:British Rail electric multiple units