B
- Bacchus (Roman mythology: Bacchus)
- GWR Charles Tayleur 2-2-2 (1837 - 1842)
- Balaklava (British battle: Battle of Balaklava)
- GWR Iron Duke class 4-2-2 (1854 - 1871)
- GWR Rover class 4-2-2 (1871 - 1892)
- Banshee (Irish mythology: Banshee)
- GWR Standard Goods 0-6-0 (1854 - 1879)
- Barum
- NDR 2-2-2- (1855 - 1870)
- Bath (Geography: Bath)
- GWR Swindon class 0-6-0 (1866 - 1874)
- Bee (Insect: Bee)
- GWR Metropolitan class 2-4-0T (1862 - 1874)
- Behemoth (Biblical: Behemoth)
- GWR Pyracmon class 0-6-0 (1848 - 1873)
- Bellerophon (Greek mythology: Bellerophon)
- GWR Premier class 0-6-0 (1846 - 1870)
- Bellona (Roman mythology: Bellona)
- GWR Fire Fly class 2-2-2 (1841 - 1870)
- Bergion
- GWR Premier class 0-6-0 (1847 - 1870)
- Berkeley (Geography: Berkeley)
- BGR 2-2-2 (1844 - 1856)
- Bey (Leader of people: Bey)
- GWR Metropolitan class 2-4-0T (1862 - 1872)
- Beyer (Famous engineer: Charles Beyer)
- GWR Hawthorn class 2-4-0 (1865 - 1877)
- GWR Hawthorn class 2-4-0T (1877 - 1887)
- Birmingham (Geography: Birmingham)
- GWR Swindon class 0-6-0 (1866 - 1873)
- Bithon
- GWR Banking class 0-6-0ST (1854 - 1871)
- Blenkensop (Famous engineer: John Blenkinsop)
- GWR Hawthorn class 2-4-0 (1865 - 1892)
- Boyne (Geography: River Boyne)
- GWR Standard Goods 0-6-0 (1857 - 1872)
- Briarcus
- GWR Premier class 0-6-0 (1847 - 1870)
- Brigand
- GWR Bogie class 4-4-0ST (1849 - 1873)
- Bright Star
- GWR Star class 2-2-2 (1841 - 1864)
- Brindley (Famous engineer: James Brindley)
- GWR Victoria class 2-4-0 (1863 - 1879)
- Bristol (Geography: Bristol)
- BGR 2-2-2 (1844 - 1855)
- GWR Swindon class 0-6-0 (1865 - 1873)
- Brontes (Greek mythology: Brontes)
- GWR Premier class 0-6-0 (1847 - 1872)
- Brunel (Famous engineer: Isambard Kingdom Brunel)
- GWR Victoria class 2-4-0 (1863 - 1879)
- Brutus (Roman personality: Marcus Junius Brutus)
- GWR Standard Goods 0-6-0 (1854 - 1874)
- SDR Dido class 0-6-0ST (1862 - 1884)
- Buffalo (Animal: Buffalo)
- GWR Leo class 2-4-0 (1841 - 1865)
- SDR Buffalo class 0-6-0ST (1872 - 1892)
- Bulkeley
- GWR Sir Watkin class 0-6-0T (1865 - 1872)
- SDR 0-6-0ST (1872 - 1890)
- GWR Rover class 4-2-2 (1880 - 1892)
- Bury (Famous engineer: Edward Bury)
- GWR Hawthorn class 2-4-0 (1865 - 1877)
- GWR Hawthorn class 2-4-0T (1877 - 1892)
- GWR Pyracmon class 0-6-0 (1848 - 1873)
Read more about this topic: List Of Broad Gauge (7 Feet) Railway Locomotive Names