British Rail Class 317

Class 317/1 The first batch of 48 units was built in 1981–1982 and was classified as Class 317/1. Units were numbered in the range 317301–317348, and had a maximum speed of . Each unit is composed of four vehicles: two unpowered standard-class vehicles with driver's cabs, an intermediate trailer with both first- and standard-class seating, and an intermediate motor vehicle with second-class seating. The motor vehicle also carries the roof-mounted Stone Faiveley AMBR pantograph. The technical description of the formation of the units is DTSO(A)-MSO-TCO-DTSO(B). The units were built to operate services on the newly electrified London St Pancras to Bedford route and were due to replace the elderly Class 127 diesel multiple units in October 1982. due to an industrial dispute with the unions over driver-only operation, and the diesel units lingered on until finally being replaced in mid-1983. Units were delivered in the standard livery of BR blue and grey. In 1986, the route came under control of the Thameslink subsector of newly created Network SouthEast. From 1987, new dual-voltage Class 319 units were introduced on the route, allowing the creation of a new cross-London service, from Bedford to Brighton, via Farringdon and City Thameslink station. The Class 317 units were displaced to outer-suburban services on the WCML out of London Euston to Milton Keynes and Northampton. They replaced the slam-door Class 310 units, which subsequently transferred to the London, Tilbury and Southend railway. However, the use of Class 317 units out of Euston again proved to be short-lived. In 1989, the second batch of new Class 321 were introduced onto WCML services. The Class 317 units were again displaced, this time to the Great Northern and West Anglia routes out of London King's Cross and London Liverpool Street, where they joined the second batch units. Therefore, for the first time, the entire Class 317 fleet was operating in the same place. Class 317/2 The second batch of 20 units was built in 1985–1986 and were classified as Class 317/2. Units were numbered in the range 317349–317368. A further four units were built in 1987 and numbered 317369–317372. These units have same DTSO(A)-MSO-TCO-DTSO(B) composition as Class 317/1 units, and have vehicles numbered in the following ranges: • DTSO(A): 77200–77219 and 77280–77283 • MSO: 62846–62865 and 62886–62889 • TCO: 71734–71753 and 71762–71765 • DTSO(B): 77220–77239 and 77284–77287 All vehicles in this batch were constructed at Holgate Road Carriage Works. The second batch units were built to operate outer-suburban trains on the Great Northern route from London King's Cross to Stevenage, Cambridge and Peterborough. Like the first batch units, they were delivered in BR Blue/Grey livery. The units replaced the slam-door Class 312 units, dating from 1975, which subsequently transferred to the Great Eastern Main Line and London-Tilbury-Southend routes. Like the DC Class 455 units, several aspects of the exterior were modified, with metal hopper ventilators replaced with larger panes of glass and the 'headcode indicator' flat front replaced with a rounded design. In 1986, the route came under the control of the newly created Network SouthEast, which introduced a new blue, red and white livery. The extension of the overhead line equipment soon allowed the units to work services on the West Anglia route from London Liverpool Street to Cambridge. In 1992, electrification spread north from Cambridge to Ely and King's Lynn, allowing the replacement of locomotive-hauled trains. The closely related Class 318 units, which were built for the Ayrshire Coast electrification in Scotland, are effectively a three-car version of the same design, but with a lower speed capability of , and with traction motors provided by Brush instead of GEC. ==Operations==

With the privatisation of Britain's railways, the Class 317 fleet was incorporated into the West Anglia Great Northern (WAGN) franchise. Since then, various changes occurred to the fleet, as units were swapped and franchises changed. The following companies operated Class 317s after privatisation. Greater Anglia in 2015 Greater Anglia operated 15 Class 317/5 units, 24 Class 317/6 units, six Class 317/8 units and 12 Class 317/1 units, the last of which were transferred from Great Northern in 2017. They were mainly used on medium-distance services between London Liverpool Street / Stratford and Broxbourne / Hertford East and on longer distance services between London Liverpool Street/Stratford and Bishop's Stortford, Harlow Town and Cambridge. They were also used on some Bishops Stortford/Stansted Airport - Cambridge services. These trains were used on rush hour services from Liverpool Street to Witham and Ipswich while some class 321s were being refurbished. There was one class 317/7 demonstrator unit 317722. This unit has now been withdrawn and scrapped. The fleet of 24 Class 317/6s were all refurbished with the following enhancements: • New carpets in first class cabins • New hard wearing, 'easy to clean' vinyl flooring in Standard Class accommodation • All the seats were re-covered into new moquette trim • Repainted grab rails • New dado side panels and wall end coverings After the Class 317/6 were refurbished, Greater Anglia then carried out an interior refresh to its 15 Class 317/5 trains. During 2021, all Class 317/6 units were scrapped at Eastleigh works. Between 2019 - 2020, a few Class 317/1s units and 317/5s units were refurbished with the following enhancements: • PRM accessible universal toilet (replacing the two passenger toilets) • Call to aid buttons • PRM door buttons • Wheelchair spaces • Improved free Wi-Fi In addition, eight Class 317/7 units formerly operated by London Overground were brought back into use by Greater Anglia in 2020 as supplementary PRM-compliant units following the withdrawal of the 317/6 fleet. The final scheduled Class 317 workings took place on 16 July 2022, with the last Class 317s withdrawn at the end of July 2022. LTS Rail & c2c In 1996, LTS Rail (renamed c2c in 2000) began to hire Class 317/1 units from its sister Prism Rail franchise WAGN for use on the London, Tilbury and Southend railway. At first only two units were hired, but by mid-1997 this had increased to a total of 18 units. Units were maintained at LTS Rail's main East Ham Depot. The Class 317 units enabled LTS Rail to replace the elderly Class 302 slam-door EMUs, the last examples of which were withdrawn in 1998. The Class 317 units also replaced some of the Class 310 fleet on off-peak workings, pending introduction of new Class 357 "Electrostar" units. Many of the units hired to LTS Rail were repainted in a variation of the existing Network SouthEast blue, red and white livery. The red stripe was replaced with a green stripe, and both the blue band and green stripe extended to the cab ends. The units were slowly returned to WAGN from 1999, with the introduction of the new "Electrostar" units. The last examples were returned by 2000. However, unreliability of the "Electrostars" meant that four units were still hired on a daily basis until 2002. These units were maintained as part of the main WAGN fleet, and therefore the specific units involved changed when units required maintenance at WAGN's Hornsey TMD depot. Thameslink In 2002, Thameslink began hiring four Class 317/1 units from WAGN to allow it to run additional Bedford to Moorgate services. Unlike when units were hired to LTS Rail, specific units were not involved. Instead, units were still maintained by WAGN and only hired for a fortnight. Two units each week were transferred in each direction, generally being hauled over the non-electrified route by two Class 31 locomotives provided by Fragonset Railways or Class 47 locomotives with barrier vehicles at either end of the Class 317. In 2004, when the WAGN franchise was split, twelve Class 317/1 units were transferred to Thameslink from the Great Northern route. This was because a planned route blockade for engineering works meant that extra units were required for Bedford services. The Class 317 units were replaced on Great Northern by Class 365 "Networkers", themselves displaced from South Eastern Trains by new Class 375 "Electrostars". The Class 317 units transferred to Thameslink were maintained at the newly built Bedford Cauldwell depot in Bedford. They were restricted to services on the Northern half of the franchise only, as only dual-voltage or DC units can operate South of Farringdon . All units were transferred to National Express East Anglia following the end of the blockade. National Express East Anglia in 2008 On 1 April 2004, the West Anglia and Stansted Express routes became part of the new One franchise. This was operated under the brand name 'one' until 26 February 2008, when it was rebranded as National Express East Anglia. During introduction, the units had one of six different liveries: the old WAGN white; a de-branded version of 'one' livery (minus the rainbow car ends); the same but with a white, National Express branded, stripe; three different Stansted Express liveries and the new National Express corporate scheme, similar to that of National Express East Coast and National Express Coaches. Stansted Express in 2005 In 2000, nine Class 317/1 units were selected to be refurbished for the dedicated Stansted Express service, from London Liverpool Street to Stansted Airport, replacing the previously dedicated Class 322 units. The work was again carried out by Railcare at Wolverton, and included the fitting of luggage racks and new window frames, identical to existing 317/2 units. The units also received a revised front end design, and a new metallic blue livery. The nine units were reclassified as Class 317/7, and were renumbered such that the last two digits of the set number remained unchanged. Some Class 317/7 units had their original Stone Faiveley AMBR pantograph replaced by the Brecknell Willis High Speed design. In 2006 12 further Class 317 EMU trains were given a more basic refresh of new carpets, re-trimmed seats in new moquette and new dado side panels; by Wabtec Doncaster and the bodysides were painted in a lighter shade of blue than the Class 317/7. These units were reclassified as Class 317/8. Both Classes 317/7 and 317/8 could occasionally be found working on West Anglia services and also it was not uncommon for Classes 317/5 and 317/6 units to work Stansted Express services alongside the dedicated Classes 317/7 and 317/8. Following the arrivals of the new Class 379 units on Stansted Express services, the Class 317/7s and 317/8s were originally used alongside other Class 317s as a common pool. This changed when Abellio took over the East Anglia franchise on 5 February 2012, as the Class 317/7s were deemed too expensive to lease and surplus to requirements, and so they entered storage. ==Aborted proposals==

Fitting of new traction equipment At the end of the National Express East Anglia franchise, Angel Trains opted to use off-lease Class 317/7 unit 317722 as a test-bed unit and engaged Bombardier Transportation to rebuild it as a pre-series unit with new traction equipment. The DC motors, traction electronics and thyristors were removed, though the original transformer remained in place. The original bogies were modified to accept new AC motors, and three-phase converters fitted. Regenerative braking was also fitted. At the same time, a £1million interior refurbishment was carried out on two vehicles of the same unit - driving trailer standard open 77021 and motor standard open 62682. The interiors were refurbished in a Metro style layout and provided a direct contrast to the 3+2 and 2+2 seating in use on the remainder of the unit. Trials to test the reaction of passengers commenced with Greater Anglia in mid-2014. Trials were not particularly successful, and the unit was kept at Ilford for several years before being withdrawn in early 2019. ==Accident==

• On 17 September 2015, unit 317346 collided with the buffer stops at King's Cross at a speed of . Fourteen people were injured. ==Fleet details==

Named units A number of units carried names these were as follows: • 317345: Driver John Webb • 317348: Richard A Jenner • 317372: Welwyn Garden City Seventy Five Years • 317654: Richard Wells • 317709: Len Camp ==Preservation==

DTSO (Driving Trailer Standard Open) vehicle 77092 from unit 317345 is preserved at the East Anglian Railway Museum, and TCO (Trailer Composite Open) vehicle 71621 from the same unit is at The Depot in Caxton. The static display will show the history of both the Class 317 fleet and that of electrification in Anglia. ==Notes==