I
- Iago (Literature: Iago)
- GWR Banking class 0-6-0ST (1852 - 1881)
- Industry
- BGR 2-4-0 (1844 - 1856)
- Inkermann (British Battle of Inkermann)
- GWR Iron Duke class 4-2-2 (1855 - 1877)
- GWR Rover class 4-2-2 (1878 - 1892)
- Iris (Greek mythology: Iris)
- GWR Standard Goods 0-6-0 (1854 - 1874)
- Iron Duke (Famous personality: see Duke of Wellington)
- GWR Iron Duke class 4-2-2 (1847 - 1871)
- GWR Rover class 4-2-2 (1873- 1892)
- Iron Duke replica 4-2-2 (Built 1985)
- Ivanhoe (Literature: Ivanhoe)
- GWR Waverley class 4-4-0 (1855 - 1876)
- Ixion (Greek mythology: Ixion)
- GWR Fire Fly class 2-2-2 (1841 - 1879)
- SDR Comet class 4-4-0ST (1853 - 1878)
Read more about this topic: List Of Broad Gauge (7 Feet) Railway Locomotive Names