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British Rail Class 122 Bubble Car
Class 122, no. 55006, at Bewdley on the Severn Valley Railway on 15 October 2004, whilst taking part in the Railcar 50 event. This unit is painted in the second version of BR Green livery, and is preserved on the Ecclesbourne Valley Railway.
Interior of W55000 on the South Devon Railway
In service
1958–1995
Manufacturer
Gloucester RC&W
Family name
First generation
Replaced
Steam locomotives and carriages
Number built
20 motor, 9 trailer
Number preserved
DMBS: 8
Formation
Single car
Diagram
DMBS: 539
DTS: 538
Fleet numbers
DMBS: 55000–55019
DTS: 56291–56299
Capacity
DMBS: 65
DTS: 95
Operators
British Rail
Depots
BY Bletchley
DE Dundee[1]
ED Eastfield[2]
HA Haymarket[2]
HN Hamilton[3]
IS Inverness[2]
LA Laira
RG Reading
TS Tyseley
Lines served
Aylesbury–Princes Risborough
Liskeard - Looe[4]
Lostwithiel - Fowey[5]
Okehampton–Bude[6]
Par - Newquay[7]
St Erth - St Ives[8]
Specifications
Car body construction
Steel
Car length
64 ft 0+1⁄2 in (19.52 m)
Width
9 ft 3 in (2.82 m)
Height
12 ft 8+1⁄8 in (3.86 m)
Doors
Slam
Articulated sections
Single car (2)
Maximum speed
70 mph (113 km/h)
Weight
DMBS: 36 long tons (81,000 lb; 37 t)
DTS: 29 long tons (65,000 lb; 29 t)
Prime mover(s)
Two BUT (AEC) then BUT (Leyland) of 150 hp (110 kW) (both types)
Power output
300 hp (220 kW)
Transmission
Standard mechanical
Safety system(s)
AWS
Multiple working
■ Blue Square
Track gauge
4 ft 8+1⁄2 in (1,435 mm)
The British Rail Class 122 diesel mechanical multiple units were built by Gloucester RC&W in 1958. Twenty single-car, double-ended driving motor vehicles, nicknamed "Bubble Cars", were built, numbered 55000–55019. These were supplemented by nine single-ended trailer vehicles, numbered 56291–56299[9] (some of which were later renumbered into the 54291–54299 block).
^British Rail Locoshed book. Ian Allan. 1981. p. 50. ISBN 0-7110-1112-5.
^ abcHemming 1978, p. 12.
^British Rail Locoshed book. Ian Allan. 1979. p. 48. ISBN 0-7110-0931-7.
^Mitchell 1994, p. 25.
^Heginbotham, Stephen (2010). Cornwall's Railways Remembered. Halsgrove. pp. 51–52. ISBN 978-0-85704-005-3.
^Mitchell 1994, p. 33.
^Mitchell 1994, p. 89.
^Mitchell 1994, p. 136.
^Butcher, Roger (November 1993). Departmental Coaching Stock (5th ed.). Southampton: South Coast Transport Publishing. pp. 60, 75. ISBN 1-872768-10-5.
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