D
- Damon (Greek mythology: Damon and Pythias)
- GWR Fire Fly class 2-2-2 (1842 - 11870)
- SDR Comet class 4-4-0ST (1852 - 1876)
- Dart (Speed: Dart; Geography: River Dart)
- GWR Fire Fly class 2-2-2 (1841 - 1870)
- NDR 2-2-2 (1855 - 1867)
- SDR Eagle class 4-4-0ST (1863 - 1885)
- NDR 2-2-2 (1868 - 1877)
- Defiance
- BGR / NDR 0-6-0 (1844 - 1867)
- Dewrance
- GWR Hawthorn class 2-4-0 (1865 - 1892)
- Diana (Greek mythology: Diana)
- GWR Standard Goods 0-6-0 (1853 - 1877)
- Dido (Classical ruler: Dido)
- GWR Caesar class 0-6-0 (1851 - 1872)
- SDR Dido class 0-6-0ST (1860 - 1877)
- Djerid
- GWR Sun class 2-2-2 (1841 - 1870)
- Dog Star
- GWR Star class 2-2-2 (1839 -1869)
- Dragon (Mythological animal: Dragon)
- GWR Iron Duke class 4-2-2 (1848 - 1872)
- SDR Buffalo class 0-6-0ST (1873 - 1892)
- GWR Rover class 4-2-2 (1880 - 1892)
- Dreadnought
- BGR / NDR 0-6-0 (1844 - 1863)
- GWR Premier class 0-6-0 (1846 - 1871)
- Dromedary (Animal: Dromedary)
- GWR Leo class 2-4-0 (1841 - 1866)
- SDR Buffalo class 0-6-0ST (1873 - 1892)
- Druid (Classical peoples: Druid)
- GWR Caesar class 0-6-0 (1851 - 1879)
Read more about this topic: List Of Broad Gauge (7 Feet) Railway Locomotive Names