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The British Rail Class 143 is a diesel multiple unit, part of the Pacer family of trains introduced between 1985 and 1986. They originally worked in the North-East of England but were later transferred to Wales and South-West England.[9]

British Rail Class 143 Pacer
Dawlish - GWR 143603 Paignton service.JPG
143603 at Dawlish
GWR Class 143 Refreshed Interior.jpg
Refreshed interior as used in service by Great Western Railway.
In service1985 – present
ManufacturerHunslet-Barclay and Walter Alexander
Order no.
  • 31005 (DMS)
  • 31006 (DMSL)[1]
Family namePacer
ReplacedFirst generation DMUs
Entered service1985
Number built25 sets
Number in service23 sets
Number scrapped2 sets (both due to fire)
  • 2 cars per set
  • DMS+DMSL[2]
Fleet numbers
  • 143001-143025 (sets, as built)
  • 55642-55666 (DMS)
  • 55667-55691 (DMSL)[4]
  • 62S (DMS)
  • 60S (DMSL)[1]
Line(s) served
Car body constructionSteel[2] underframe. Aluminium alloy body and roof.
Car length15.546 m (51 ft 0 in)[3]
Width2.695 m (8 ft 10.1 in)[3]
Height3.515 m (11 ft 6.4 in)[3]
DoorsTwin leaf pivot[2]
Articulated sections2
Wheelbase9.000 m (29 ft 6.3 in)[3]
Maximum speed75 mph (121 km/h)
  • 24 t (24 long tons; 26 short tons) (DMS)
  • 24.5 t (24.1 long tons; 27.0 short tons) (DMSL)[1]
Prime mover(s)
  • 1 × Cummins LTA10-R[7] 230 hp (170 kW) (per car)[2]
  • (Originally fitted with Leyland TL11[1] 6-cylinder 11.1-litre)
Engine type10-litre[7] diesel
Cylinder count6
Power output
  • Cummins: 225 hp (168 kW) at 2100 rpm[7]
  • Leyland: 205 hp (153 kW)[1] at 1950 rpm
Train heatingEngine waste heat, ducted warm air[3]
BogiesNone, Ax1[3] fixed axle
Braking system(s)Air[3]
Safety system(s)
Coupling systemBSI[8]
Multiple workingClasses 14x, 15x and 170[2]
Track gauge1,435 mm (4 ft 8 12 in) standard gauge



The Rail Vehicle Accessibility (Interoperable Rail System) Regulations 2008[10] require that all public passenger trains must be accessible by 1 January 2020. No Class 143 train currently meets this requirement. Porterbrook has proposed an extensive refurbishment of the Class 143 and 144 units in an attempt to meet this requirement although this would significantly reduce the number of seats.[11]

First Great Western are planning on withdrawing their eight by December 2019 with a cascade programme allowing them to be replaced with Class 150s.[12]

The units are currently used on short distance services around Cardiff and Exeter. Previously they were common on services in the Bristol area.

Unlike most other stock on the UK network, Class 143s (in common with other Pacers) lack bogies, instead having single axles at each end of the vehicle (Red Boxes).


On 17 October 2004, Wessex Trains unit 143613, forming the 20:06 2W63 service from Bristol Temple Meads to Weston-super-Mare with 143621, caught fire between the site of the former Flax Bourton railway station and Nailsea and Backwell. Fire services took two hours to get the blaze under control. Of the 23 passengers and crew, three were treated on-site for the effects of smoke inhalation. One carriage was completely burnt out, and the other was badly damaged, causing the train to be written off.[13] The line through Nailsea was closed until 03:30 the following morning, when the train was hauled to St Philips Marsh Traction and Rolling Stock Maintenance Depot for examination.[14] The unit was later taken to Crewe Works where it was stored,[14][15] then later to Cardiff Canton TMD where it was scrapped.[16] The Rail Safety and Standards Board issued a report into the incident, concluding that the fire was caused by electrical arcing between the live starter motor cable (which had damaged insulation) and the unit's underframe, causing accumulated oily residues to ignite.[17]

Fleet detailsEdit

Class Operator No. Built Year Built Cars per Set Unit nos. Notes
Class 143 Transport for Wales 15 1985-1986 2 143601/602/604-610/614/616/622-625 143615 withdrawn after fire damage (2005)
Great Western Railway 8 143603/611/612/617-621 143613 withdrawn after a fire (2004)
Arriva Trains Wales livery
Great Western Railway livery

Named unitsEdit

Several units have received a name:




  1. ^ a b c d e f g Fox 1987, p. 41
  2. ^ a b c d e f "Class 143". The Railway Centre. Archived from the original on 9 March 2005.
  3. ^ a b c d e f g h i j Vehicle Diagram Book No. 220 for Diesel Multiple Unit Trains (Railcars) (PDF). Barrowmore MRG. Derby: British Railways Board. 1982. DP236, DP237.
  4. ^ a b Fox 1987, pp. 41-42
  5. ^ a b Fox & Hughes 1994, p. 26
  6. ^ "Fleet lists: Class 143". Archived from the original on 17 January 2007.
  7. ^ a b c Pritchard & Fox 2009, p. 14
  8. ^ "System Data for Mechanical and Electrical Coupling of Rail Vehicles". Rail Safety and Standards Board. Archived from the original on 5 July 2008. Retrieved 5 January 2009.
  9. ^ "Class 143". The Railway Centre. Archived from the original on 8 March 2005.
  10. ^ "The Rail Vehicle Accessibility (Interoperable Rail System) Regulations 2008".
  11. ^ "Archived copy" (PDF). Archived from the original (PDF) on 11 March 2014. Retrieved 11 March 2014.CS1 maint: Archived copy as title (link)
  12. ^ "Modernising the Great Western railway" (PDF). p. 49.
  13. ^ "Commuters escape from train blaze". BBC News. 19 October 2004. Retrieved 20 April 2012.
  14. ^ a b "December 2004 magazine". Cardiff & Avonside Railway Society. December 2004. Retrieved 27 April 2012. A serious incident just short of Nailsea & Backwell station (alongside the common), saw the 2W63 20.06 Temple Meads-Weston-super-Mare local Wessex Trains service, formed with 143613 + 143621, stopped and evacuated due to a fire which gutted coach 55654 and smoke damaged 55679 (both from set 143613). Fire services took two hours to get the blaze under control, the flames reaching around 20 feet in height, but there were no serious injuries, three persons being treated for smoke inhalation of the 23 passengers and crew travelling on the service. The mainline was closed until 03.30 the following day, the units being dragged back to Bristol and store at St.Phillips Marsh depot for examination. The fire was thought to have started due to a mechanical fault. 19/10 143613 was taken to St Phillips Marsh for an investigation into the fire. The main frame of 55654 was badly buckled and it is beyond repair. The unit was taken by road to Crewe Works later in the week.
  15. ^ "November 2005". Cardiff & Avonside Railway Society. November 2005. Retrieved 17 June 2012. Stored: 143613/615 - ZC [Crewe Works]
  16. ^ "September 2006". Cardiff & Avonside Railway Society. September 2006. Retrieved 17 June 2012. Disposals: Pullman : 143613 @CF [Cardiff Canton]
  17. ^ "August 2005 section: "Miscellaneous"". Cardiff & Avonside Railway Society. August 2005. Retrieved 27 April 2012.
  18. ^ "DMU FORMATIONS". AbRail. Retrieved 27 March 2015.
  19. ^ "Class 143". Retrieved 22 August 2018.
  20. ^ "Class 143". Retrieved 22 August 2018.
  21. ^ "Class 143". Retrieved 22 August 2018.


  • Fox, Peter (1987). Multiple Unit Pocket Book. British Railways Pocket Book No.2 (Summer/Autumn 1987 ed.). Platform 5 Publishing Ltd. ISBN 0906579740. OCLC 613347580.
  • Fox, Peter; Hughes, Barry (1994). DMUs & Channel Tunnel Stock. British Railways Pocket Book No.3 (7th ed.). Platform 5. ISBN 9781872524597.
  • Pritchard, R.N.; Fox, Peter (2009). Diesel Multiple Units 2010. British Railways Pocket Book No.3. Platform 5. ISBN 978-1-902336-75-6. OCLC 614300319.