A
- Abbot (Literature: The Abbot)
- GWR Waverley class 4-4-0 (1855 - 1876)
- Abdul Medjid (Famous personality: Abdul Medjid of Turkey)
- GWR Victoria class 2-4-0 (1856 - 1877)
- Acheron (Greek mythology: Acheron)
- GWR Fire Fly class 2-2-2 (1842 - 1866)
- GWR Hawthorn class 2-4-0 (1866 - 1887)
- Achilles (Greek mythology: Achilles)
- GWR Fire Fly class 2-2-2 (1841 -1867)
- SDR Buffalo class 0-6-0ST (1873 - 1892)
- Actaeon (Greek mythology: Actaeon)
- GWR Fire Fly class 2-2-2 (1841 - 1868)
- Ada
- LVR and SDR 0-6-0ST (1862 - 1884)
- Aeolus (Greek mythology: Aeolus)
- GWR Charles Tayleur 2-2-2 (1837 - 1867)
- Ajax (Greek mythology: Ajax)
- GWR Mather, Dixon 2-2-2 (1838 - 1840)
- GWR Premier class 0-6-0 (1846 - 1871)
- SDR Dido class 0-6-0ST (1860 - 1884)
- Alexander (Famous personality: Alexander II of Russia)
- GWR Victoria class 2-4-0 (1856 - 1878)
- Aligator (Powerful animal: Alligator)
- GWR Pyracmon class 0-6-0 (1848 - 1873)
- Alma (British battle: Battle of Alma)
- GWR Iron Duke class 4-2-2 (1854 - 1872)
- GWR Rover class 4-2-2 (1880 - 1892)
- Amazon (Mythical peoples: Amazons)
- GWR Iron Duke class 4-2-2 (1851 - 1877)
- GWR Rover class 4-2-2 (1878 - 1892)
- Amphion (Greek mythology: Amphion)
- GWR Standard Goods 0-6-0 (1856 - 1877)
- Antelope (Fast animal: Antelope)
- GWR Sun class 2-2-2 (1841 - 1870)
- SDR Eagle class 4-4-0ST (1859 - 1884)
- Antiquary (Literature: The Antiquary)
- GWR Waverley class 4-4-0 (1855 - 1876)
- Apollo (Greek mythology: Apollo)
- GWR Charles Tayleur 2-2-2 (1838 - 1867)
- Aquarius (Zodiac: Aquarius)
- GWR Leo class 2-4-0 (1842 - 1870)
- Arab (Classical peoples: Arab)
- GWR Fire Fly class 2-2-2 (1841 - 1870)
- Ariadne (Greek mythology: Ariadne)
- GWR Standard Goods 0-6-0 (1852 - 1879)
- Ariel (Biblical: Ariel)
- GWR Mather, Dixon 2-2-2 (1838 - 1840)
- Aries (Zodiac: Aries)
- GWR Leo class 2-4-0 (1841 - 1871)
- Argo (Greek mythology: Argo)
- GWR Premier class 0-6-0 (1846 - 1855)
- SDR Dido class 0-6-0ST (1863 - 1892)
- Argus (Greek mythology: see Argo)
- GWR Fire Fly class 2-2-2 (1842 - 1873)
- Arrow (Speed: Arrow)
- GWR Fire Fly class 2-2-2 (1841 - 1864)
- Assagais
- GWR Sun class 2-2-2 (1841 - 1875)
- Atlas (Greek mythology: Atlas)
- GWR Sharp, Roberts 2-2-2 (1838 - 1872)
- SDR Dido class 0-6-0ST (1863 - 1885)
- Aurora (Greek mythology: Aurora)
- GWR Sun class 2-2-2 (1840 - 1866)
- SDR Comet class 4-4-0ST (1852 - 1878)
- Avalanche (Power: Avalanche)
- GWR Banking class 0-6-0ST (1846 - 1865)
- Avon (Geography: River Avon)
- GWR Standard Goods 0-6-0 (1857 - 1877)
- Avonside (Engineer: see Avonside Engine Company)
- GWR Hawthorn class 2-4-0 (c.1865 - 1892)
- Azalia (Flower: Azalea)
- GWR Metropolitan class 2-4-0T (1864 - 1872)
Read more about this topic: List Of Broad Gauge (7 Feet) Railway Locomotive Names