Class 158
| British Rail Class 158 Express Sprinter | |
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Arriva Trains Wales refurbished Class 158 No. 158818 at Ruabon
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The interior of refurbished Arriva Trains Wales Class 158
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| In service | 17 September 1990 |
| Manufacturer | BREL |
| Built at | Derby Works |
| Family name | Sprinter |
| Constructed | 1989—1992 |
| Number built | 182 trainsets (30 converted to 159s) |
| Number in service | 170 trainsets |
| Formation | 2 or 3 cars per trainset |
| Capacity |
Northern: 138, 142 (158/0 & 158/9) or 207 (158/0) seats per unit |
| Operator(s) |
Arriva Trains Wales East Midlands Trains Great Western Railway Abellio ScotRail Northern South West Trains State Railway of Thailand |
| Specifications | |
| Car body construction | Welded aluminium |
| Car length | 23.21 m (76 ft 2 in) |
| Width | 2.7 m (8 ft 10 in) |
| Articulated sections | Flexible diaphragm within and between units |
| Maximum speed | 90 mph (140 km/h) |
| Weight | 37.8 t (41.7 short tons; 37.2 long tons) or 38.5 t (42.4 short tons; 37.9 long tons) per car |
| Traction system | DMU |
| Prime mover(s) |
Diesel, one per car Cummins NTA855R1 (158701 - 158814 and 158901 - 158910) Perkins 2006-TWH (158815 - 158862) Cummins NTA855R3 (158863 - 158872) numbers as built |
| Power output | Cummins: 350 hp (260 kW) Perkins 350 hp (260 kW) Cummins: 400 hp (300 kW) |
| Transmission |
Voith T211rz or T211rzz hydraulic Gmeinder GM 190 final drive 2 axles driven per car |
| Braking system(s) | Pneumatic, Disc |
| Safety system(s) | BSI |
| Multiple working | Class 150, Class 153, Class 156, Class 159, Class 170 |
| Track gauge | 1,435 mm (4 ft 8 1⁄2 in) (1000 mm metre gauge in Thailand) |
The British Rail Class 158 Express Sprinter is a diesel multiple-unit (or DMU), built specifically for British Rail between 1989 and 1992 by BREL at its Derby Works. They were built to replace many locomotive-hauled passenger trains, and allowed cascading of existing Sprinter units to replace elderly 'heritage' DMUs. The Class 159 DMUs are almost identical to the Class 158s, having been converted from Class 158 to Class 159 in two batches.
A total of 182 units were built. The majority were built as two-car sets. 17 units were built as three-car units; eight of these units have since had the centre car removed, whilst another eight have been upgraded to be Class 159s. The final ten units were built specifically for West Yorkshire PTE Metro services around Leeds.
There were three varieties of unit when built. The standard batch, two- and three-car units (158701—158814 and 158901—158910) had 350 hp (260 kW) Cummins engines. The next batch (158815—158862) were built as non-standard to enable 350 hp (260 kW) Perkins engines to be fitted. The final batch (158863—158872) were given higher-powered Cummins engines of 400 hp (300 kW), as it was originally intended that these units would work the steeply graded Welsh Marches Line. Another 22 of these higher-powered units were built, and became three-car Class 159s. Over time, the units have become mixed up as franchises changed, and higher- and lower-powered units can be seen working on the same routes. All units use P4-4A and T4-4A bogies.
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