L
- Lagoon
- GWR Standard Goods 0-6-0 (1861 - 1876)
- Lalla Rookh (Literary: Lalla-Rookh)
- GWR Waverley class 4-4-0 (1855 - 1872)
- Lance (Speed: Lance)
- GWR Sun class 2-2-2 (1841 - 1870)
- SDR Comet class 4-4-0ST (1851 - 1873)
- SDR Leopard class 4-4-0ST (1875 - 1892)
- Lark (Bird: Lark)
- SDR Raven class 0-4-0ST (1874 - 1892)
- Laurel (Tree: Bay Laurel)
- GWR Metropolitan class 2-4-0T (1864 - 1872)
- Leander (Greek mythology: Hero and Leander)
- GWR Standard Goods 0-6-0 (1852 - 1875)
- Leo (Zodiac: Leo)
- GWR Leo class 2-4-0 (1841 - 1870)
- Leonidas (Classical ruler: Leonidas I)
- GWR Standard Goods 0-6-0 (1863 - 1881)
- Leopard (Fast animal: Leopard)
- GWR Fire Fly class 2-2-2 (1840 - 1878)
- SDR Leopard class 4-4-0ST (1872 - 1893)
- Leopold (Famous personality: Leopold I of Belgium)
- GWR Victoria class 2-4-0 (1856 - 1877)
- Lethe (Greek mythology: Lethe)
- GWR Fire Fly class 2-2-2 (1842 - 1878)
- Libra (Zodiac: Libra)
- GWR Leo class 2-4-0 (1841 - 1871)
- Liffey (Geography: River Liffey)
- GWR Standard Goods 0-6-0 (1855 - 1872)
- Lightning (Speed: Lightning)
- GWR Iron Duke class 4-2-2 (1847 - 1878)
- GWR Rover class 4-2-2 (1878 - 1892)
- Lily (Flower: Lily)
- GWR Metropolitan class 2-4-0T (1864 - 1872)
- Lion (Powerful animal: Lion)
- GWR Sharp, Roberts 2-2-2 (1838 - 1847)
- SDR Eagle class 4-4-0ST (1859 - 1883)
- Load Star
- GWR Star class 2-2-2 (1841 - 1870)
- Locke (Famous engineer: Joseph Locke)
- GWR Victoria class 2-4-0 (1863 - 1881)
- Locust (Insect: Locust)
- GWR Metropolitan class 2-4-0T (1862 - 1876)
- London (Geography: London)
- GWR Swindon class 0-6-0 (1865 - 1873)
- Lord of the Isles (Leader of people: Lord of the Isles)
- GWR Iron Duke class 4-2-2 (1851 - 1884)
- Lucan (Roman personality: Lucan)
- GWR Bogie class 4-4-0ST (1855 - 1872)
- Lucifer (Roman mythology: Lucifer)
- GWR Fire Fly class 2-2-2 (1841 - 1870)
- Lucretius (Roman personality: Lucretius)
- GWR Bogie class 4-4-0ST (1854 - 1872)
- Luna (Roman mythology: Luna)
- GWR Standard Goods 0-6-0 (1863 - 1880)
- Lynx (Fast animal: Lynx)
- GWR Fire Fly class 2-2-2 (1840 -1870)
- SDR Eagle class 4-4-0ST (1859 - 1876)
Read more about this topic: List Of Broad Gauge (7 Feet) Railway Locomotive Names