| GWR railcars | |
|---|---|
 AEC railcar No. 27 at Tenbury Wells station in 1949 | |
| In service | 1934–1962 |
| Manufacturer | Park Royal Gloucester RCW Swindon Works |
| Replaced | Steam locomotives and carriages |
| Constructed | 1934–1942 |
| Entered service | 1934 |
| Scrapped | 1954–1962 |
| Number built | 38 cars |
| Number preserved | 3 cars |
| Number scrapped | 35 cars |
| Successor | British Rail Class 121 British Rail Class 122 |
| Fleet numbers | 1–38 |
| Capacity | 44–70 seats |
| Operators | Great Western Railway British Railways |
| Lines served | Western Region |
| Specifications | |
| Maximum speed | 63 mph (101 km/h) to 80 mph (130 km/h) |
| HVAC | steam heating |
| Track gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
In 1933, the Great Western Railway introduced the first of what was to become a successful series of diesel railcars, which survived in regular use into the 1960s, when they were replaced with the new British Rail "first generation" type diesel multiple units.