British Rail Class 117
A Class 117 atDidcot Parkway, 1989
Interior of a Class 117.
In service	1959–2000; one unit used in departmental use until 2015
Manufacturer	Pressed Steel Company
Family name	First generation
Replaced	Steam locomotives and carriages
Constructed	1959–1961
Number built	123 cars (42 DMBS, 42 DMS, 39 TCL)
Number preserved	35 cars (17 DMBS, 16 DMS, 23 TCL)
Number scrapped	88 cars (25 DMBS, 26 DMS, 16 TCL)
Successor	Class 150[1] Class 153[2] Class 156[3] Class 165[2] Class 166[4]
Formation	DMBS-TCL-DMS
Operators	British Rail ScotRail Silverlink
Lines served	Western Region London Midland region Scottish region
Specifications
Car body construction	Steel
Car length	64 ft 0 in (19.51 m)
Width	9 ft 3 in (2.82 m)
Height	12 ft8+1⁄2 in (3.87 m)
Doors	Slam
Maximum speed	70 mph (113 km/h)
Weight	Power cars: 36 long tons 0 cwt (80,600 lb or 36.6 t), Trailer cars: 30 long tons 0 cwt (67,200 lb or 30.5 t)
Prime mover(s)	BUT (AEC) then BUT (Leyland), of 150 hp (110 kW), (both types), two per power car
Power output	600 hp (450 kW) per 3-car set
Transmission	Mechanical
HVAC	Oil burning air heater
Braking system(s)	Vacuum
Safety system(s)	AWS
Coupling system	Screw
Multiple working	■ Blue Square
Track gauge	4 ft 8+1⁄2 in (1,435 mm)

TheBritish Rail Class 117diesel multiple units (DMUs) were built byPressed Steel from 1959 to 1961. It was a licence-built variant of theBritish Rail Class 116.^[5]

A total of 123 Class 117 cars were built byPressed Steel between 1959 and 1961, delivered as 39 three-car units plus three pairs of spare motor coaches. When first introduced in 1960, these three-car units were all based with the similarClass 121 single carriage (railcar) units on British RailwaysWestern Region for suburban work out of London Paddington. The units were largely based atReading andSouthall depots. The units remained here for many years working these services.^{[citation needed]}

The type was used for a railtour from Paddington to the south west on 31 May 1969.^{[citation needed]}

In the 1980s, expiry of other DMUs facilitated moves for some units from the Western Region to Birmingham, as below, and Scotland, prior to the delivery of new units to replace them. They were given refurbishments.

The first shake up in ownership occurred in the late 1980s, when the Scottish, Welsh, Cornish and Birmingham based units were transferred to Provincial Services, laterRegional Railways, in the sectorisation ofBritish Rail, while the Southall-based units transferred toNetwork SouthEast.

They were replaced on the lines out ofPaddington when theClass 165/1 Network Turbo units came into service by 28 November 1992.^{[citation needed]}

They soldiered on in the former Western Region until replaced byClass 150 andClass 153 DMUs by 21 May 1993, although the type could be found running Penzance - Looe services until 1997. An attempt was made to remove them from Cornish work usingClass 142 "Skipper/Pacer" railcars, but these fixed wheelbase units proved to be a liability on the tight Cornish branchline curves, increasing rail and wheel wear, and were transferred to the North of England instead. The 117s were finally replaced with the advent of more Class 150s and Class 153s freed up from other areas.^[6]

The type was used in Scotland between Edinburgh - Perth, Cowdenbeath and Markinch using theForth Bridge and continued to work in Scotland until 12 January 1998, where they were replaced withClass 156s^[3]. The final day of 117s running in Scotland was 27 November 1999.^[7]

In 2000,Class 150Sprinter units replaced the Class 117 units onSilverlink, finally bringing to an end decades of service on Britain's rail network in front line service.^[1]

Due to the type's longevity, 12 units have been preserved onheritage railways.

• Golding, Brian (1995).A Pictorial Record of British Railways Diesel Multiple Units. Stadhampton: Cheona.ISBN 9781900298001.OCLC 59628291.
• Haresnape, Brian (1985).British Rail Fleet Survey. Vol. 8: Diesel Multiple Units - The First Generation. Shepperton: Ian Allan.ISBN 9780711014954.OCLC 810581284.
• Marsden, Colin J. (1986).Motive Power Recognition. Vol. 3 DMUs. London: Ian Allan.ISBN 9780711015708.OCLC 16471467.
• Robertson, Kevin (2004).British Railway Pictorial: First Generation DMUs. Hersham: Ian Allan.ISBN 9780711029705.OCLC 56454643.

• Bendall, Simon; Lowery, Dave; Forsythe, Robert (November 2003). "Sound of the suburbs".Model Rail. No. 61. Peterborough: EMAP Apex. pp. 18–24.ISSN 1369-5118.OCLC 173324502.

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