| No. | Class | F.M. Whyte | Gauge | Railroad Line | Location | Status | Builder Info | Notes |
|---|
| 8 | | 2-6-2T | 23.75" | GWR | Vale of Rheidol Railway, Aberystwyth, WAL | operational | GWR Swindon Works, 1923 | Named Llywelyn. |
| 6435 | 6400 | 0-6-0PT | 4'-8½" | BR (GWR) | Bodmin & Wenford Railway, Bodmin, ENG | operational | GWR Swindon Works, 1937 | |
| 4612 | 5700 | 0-6-0PT | 4'-8½" | GWR | Bodmin & Wenford Railway, Bodmin, ENG | operational | GWR Swindon Works, 1942 | |
| 4247 | 4200 | 2-8-0T | 4'-8½" | BR (GWR) | Bodmin & Wenford Railway, Bodmin, ENG | operational | GWR Swindon Works #2637, 1916 | |
| 151 | | 0-4-0VBT | 84¼" | GWR | South Devon Railway, Buckfastleigh, ENG | display | Sara & Co. #2180, 1868 | Named Tiny. Only surviving commercial Brunel gauge steam locomotive in the UK. |
| 3205 | 2251 | 0-6-0 | 4'-8½" | GWR (BR) | South Devon Railway, Buckfastleigh, ENG | out of service | GWR Swindon Works, 1946 | Owned by the 2251 Fund. Restored to operation in May 1970. Taken out of service in 2006. Returned to operation in May 2010. Taken out of service again in 2017. Awaiting overhaul. |
| 1369 | 1366 | 0-6-0PT | 4'-8½" | GWR | South Devon Railway, Buckfastleigh, ENG | operational | GWR Swindon Works, 1934 | |
| 5637 | 5600 | 0-6-2T | 4'-8½" | BR (GWR) | East Somerset Railway, Cranmore, ENG | operational | GWR Swindon Works, 1925 | |
| 5029 | 4073 | 4-6-0 | 4'-8½" | BR (GWR) | Crewe Works (Royal Scot Locomotive & General Trust), Crewe, ENG | out of service | GWR Swindon Works, 1934 | Named Nunney Castle. Restored to operation in 1990. Taken out of service in late 2015. Awaiting overhaul. |
| 93 | Steam Railmotor (Diagram R) | | 4'-8½" | GWR | Didcot Railway Centre, Didcot, ENG | operational | GWR Swindon Works, 1908 | Only surviving GWR steam railmotor. Restored to operation in 2011. |
| 1338 | | 0-4-0ST | 4'-8½" | GWR (Cardiff) | Didcot Railway Centre, Didcot, ENG | out of service | Kitson & Co. #3799, 1898 | Restored to operation in 1987. Debuted in excursion service in 2000. Previously operated in June 2007. Awaiting overhaul. |
| 3650 | 5700 | 0-6-0PT | 4'-8½" | GWR | Didcot Railway Centre, Didcot, ENG | operational | GWR Swindon Works, 1939 | |
| | 2-2-2 | 84¼ | GWR | Didcot Railway Centre, Didcot, ENG | restoration | Fire Fly Project, 2005 | Replica. Named Fire Fly. Will become the only operational Brunel gauge steam locomotive in the world when the restoration to operation is complete. |
| 4144 | 5101 | 2-6-2T | 4'-8½" | BR (GWR) | Didcot Railway Centre, Didcot, ENG | operational | GWR Swindon Works, 1946 | |
| 5051 | 4073 | 4-6-0 | 4'-8½" | GWR (BR) | Didcot Railway Centre, Didcot, ENG | out of service | GWR Swindon Works, 05/1936 | Named Earl Bathurst. Previously named Drysllwyn Castle. Restored to operation in 1979. Previously operated in 2008. Awaiting possible overhaul. |
| 2999 | 2900 | 4-6-0 | 4'-8½" | GWR | Didcot Railway Centre, Didcot, ENG | operational | GWR Swindon Works, 2019 | Named Lady of Legend. Construction completed in 2019. Second newly-built steam locomotive in the UK. Built using parts from GWR Hall class 4942 "Maindy Hall". |
| 6023 | 6000 | 4-6-0 | 4'-8½" | BR (GWR) | Didcot Railway Centre, Didcot, ENG | out of service | GWR Swindon Works, 1930 | Named King Edward II. Taken out of service for major maintenance in September 2012. Returned to operation in January 2013. Taken out of service again in September 2020. Awaiting overhaul. |
| 4942 | 4900 | 4-6-0 | 4'-8½" | GWR (BR) | Didcot Railway Centre, Didcot, ENG | scrapped | GWR Swindon Works, 1929 | Named Maindy Hall. Scrapped sometime during the late 2010s. Some parts have been reused for the construction of newly-built GWR Saint class 2999 "Lady of Legend". |
| 4079 | 4073 | 4-6-0 | 4'-8½" | GWR (BR) | Didcot Railway Centre, Didcot, ENG | operational | GWR Swindon Works, 02/1924 | Named Pendennis Castle. Operated in excursion service in Australia from 1978 to 1994. Restored back to operation in August 2021. Debuted in excursion service in the UK on April 2, 2022. |
| 1014 | 1000 | 4-6-0 | 4'-8½" | GWR | Didcot Railway Centre, Didcot, ENG | under construction | GWR Swindon Works | Named County of Glamorgan. Being built using parts from a GWR Hall class (the boiler will come from an LMS 8F class). |
| 5619 | 5600 | 0-6-2T | 4'-8½" | BR (GWR) | Telford Steam Railway, Horsehay, ENG | operational | GWR Swindon Works, 1925 | |
| 813 (26) | | 0-6-0ST | 4'-8½" | GWR (Port Talbot Railway & Docks) | Severn Valley Railway, Kidderminster, ENG | out of service | Hudswell, Clarke & Co. #555, 06/1901 | Owned by the GWR 813 Preservation Fund. Restored to operation in July 2000. Taken out of service in September 2009. Returned to operation in August 2016. Taken out of service again in April 2022 due to a fracture in the supports under the cab. |
| 2857 | 2800 | 2-8-0 | 4'-8½" | GWR | Severn Valley Railway, Kidderminster, ENG | out of service | GWR Swindon Works #2763, 1918 | Restored to operation in September 1979. Taken out of service in January 2023. Awaiting overhaul. |
| 7812 | 7800 | 4-6-0 | 4'-8½" | BR (GWR) | Severn Valley Railway, Kidderminster, ENG | out of service | GWR Swindon Works, 01/1939 | Named Erlestoke Manor. Owned by the Erlestoke Manor Fund. Restored to operation in September 1979. Taken out of service in December 2017. Undergoing major maintenance and repairs as of December 2022. |
| 7802 | 7800 | 4-6-0 | 4'-8½" | BR (GWR) | Severn Valley Railway, Kidderminster, ENG | out of service | GWR Swindon Works, 01/1938 | Named Bradley Manor. Owned by the Erlestoke Manor Fund. Restored to operation in 1993. Taken out of service in July 2019 due to a broken piston. Undergoing major maintenance and repairs as of November 2022. |
| 6430 | 6400 | 0-6-0PT | 4'-8½" | GWR | Llangollen Railway, Llangollen, WAL | operational | GWR Swindon Works, 1937 | |
| 5199 | 5101 | 2-6-2T | 4'-8½" | GWR | Llangollen Railway, Llangollen, WAL | out of service | GWR Swindon Works, 1934 | Restored to operation in 2003. Taken out of service for an overhaul in Jan 2019. Returned to operation in Apr 2019. Leased to the West Somerset Railway, Minehead, ENG from Dec 2020 to Dec 2022. Taken out of service again in Oct 2023. Undergoing overhaul. |
| 3882 | 2884 | 2-8-0 | 4'-8½" | GWR | Llangollen Railway, Llangollen, WAL | operational | GWR Swindon Works, 1938 | |
| 5972 | 4900 | 4-6-0 | 4'-8½" | Hogwarts Railways (GWR) | Warner Bros. Studio Tour London, London, ENG | out of service | GWR Swindon Works, 04/1937 | Named Olton Hall. Fictionally named Hogwarts Castle. Owned by West Coast Railway Co. Featured in the Harry Potter films. Taken out of service in 2014. Awaiting possible overhaul. |
| 9351 | 9300 | 2-6-0 | 4'-8½" | BR (GWR) | West Somerset Railway, Minehead, ENG | operational | GWR Swindon Works, 10/1934 | Originally built as a GWR 5101 class 2-6-2T type. Previously converted to a GWR 4300 class 2-6-0 type. Converted again to a GWR 9300 class in 2004. Taken out of service in late 2013. Returned to operation in January 2019. |
| 3850 | 2884 | 2-8-0 | 4'-8½" | BR (GWR) | West Somerset Railway, Minehead, ENG | out of service | GWR Swindon Works, 06/1942 | Owned by the Dinmore Manor Locomotive Ltd. Restored to operation in 2006. Taken out of service in September 2015. Undergoing overhaul. |
| 6024 | 6000 | 4-6-0 | 4'-8½" | BR (GWR) | West Somerset Railway, Minehead, ENG | operational | GWR Swindon Works, 06/1930 | Named King Edward I. Owned by the Royal Scot Locomotive & General Trust. Restored to operation in February 1989. Taken out of service in April 2012. Returned to operation in August 2022. |
| 6960 | 6959 | 4-6-0 | 4'-8½" | GWR (BR) | West Somerset Railway, Minehead, ENG | out of service | GWR Swindon Works, 03/1944 | Named Raveningham Hall. Owned by the Locomotive Services Ltd. Restored to operation in 1975. Taken out of service in April 2003. Returned to operation in November 2011. Taken out of service again in July 2021. Awaiting overhaul. |
| 4141 | 5101 | 2-6-2T | 4'-8½" | GWR | Epping Ongar Railway, Ongar, ENG | operational | GWR Swindon Works, 1946 | |
| 4277 | 4200 | 2-8-0T | 4'-8½" | GWR | Dartmouth Steam Railway & River Boat Co., Paignton, ENG | operational | GWR Swindon Works #2857, 1920 | Named Hercules. |
| 5239 | 5205 | 2-8-0T | 4'-8½" | GWR | Dartmouth Steam Railway & River Boat Co., Paignton, ENG | operational | GWR Swindon Works, 1924 | Named Goliath. |
| 3717 (3440) | 3700 | 4-4-0 | 4'-8½" | GWR | Museum of the Great Western Railway, Swindon, ENG | display | GWR Swindon Works #2000, 04/1903 | Named City of Truro. Became the first steam locomotive in the UK claimed to have reached 100 mph (102 mph, 1904). Retired from excursion service in 2006 due to firebox damage. |
| 6000 | 6000 | 4-6-0 | 4'-8½" | BR (GWR) | Museum of the Great Western Railway, Swindon, ENG | display | GWR Swindon Works, 06/1927 | Named King George V. Owned by the National Railway Museum York. Restored to operation in November 1968. Retired from excursion service in September 1987. |
| 4073 | 4073 | 4-6-0 | 4'-8½" | GWR (BR) | Museum of the Great Western Railway, Swindon, ENG | display | GWR Swindon Works, 08/1923 | Named Caerphilly Castle. Owned by the National Railway Museum York. |
| 5542 | 4575 | 2-6-2T | 4'-8½" | GWR | Gloucestershire Warwickshire Railway, Toddington, ENG | operational | GWR Swindon Works, 1928 | |
| 2807 | 2800 | 2-8-0 | 4'-8½" | GWR | Gloucestershire Warwickshire Railway, Toddington, ENG | operational | GWR Swindon Works #2102, 10/1905 | |
| 4270 | 4200 | 2-8-0T | 4'-8½" | GWR | Gloucestershire Warwickshire Railway, Toddington, ENG | operational | GWR Swindon Works #2850, 1919 | Owned by Locomotive Services Ltd. |
| 9600 | 5700 | 0-6-0PT | 4'-8½" | BR (GWR) | Tyseley Locomotive Works, Tyseley, ENG | private operational | GWR Swindon Works, 1945 | |
| 4965 | 4900 | 4-6-0 | 4'-8½" | GWR | Tyseley Locomotive Works, Tyseley, ENG | out of service | GWR Swindon Works, 1931 | Named Rood Ashton Hall. Taken out of service in June 2019 due to major boiler work. Awaiting overhaul. |
| 5080 | 4073 | 4-6-0 | 4'-8½" | GWR (BR) | Tyseley Locomotive Works, Tyseley, ENG | out of service | GWR Swindon Works, 05/1939 | Named Defiant. Previously Named Ogmore Castle. Restored to operation in July 1987. Previously operated in 1997. Loaned to the Buckinghamshire Railway Centre, Quainton, ENG from January 2002 to May 2017. Awaiting possible overhaul. |
| 5043 | 4073 | 4-6-0 | 4'-8½" | BR (GWR) | Tyseley Locomotive Works, Tyseley, ENG | private operational | GWR Swindon Works, 1936 | Named Earl of Mount Edgcumbe. Previously named Banbury Castle. Taken out of service in 2018. Returned to operation on February 24, 2023. Currently certified for mainline operations. |
| 6880 | 6800 | 4-6-0 | 4'-8½" | GWR | Tyseley Locomotive Works, Tyseley, ENG | operational | GWR Swindon Works, 04/2024 | Named Betton Grange. Construction completed on April 12, 2024. Third newly-built steam locomotive in the UK. Built using parts from a GWR Hall class. |
| 4003 | 4000 | 4-6-0 | 4'-8½" | GWR | National Railway Museum, York, ENG | display | GWR Swindon Works, 1907 | Named Lode Star. Only surviving GWR Star class locomotive. |