J
- Janus (Greek mythology: Janus)
- GWR Standard Goods 0-6-0(1854 - 1880)
- Jason (Greek mythology: Jason)
- GWR Premier class 0-6-0 (1847 - 1870)
- Javelin
- GWR Sun class 2-2-2 (1841 - 1870)
- Jay (Bird: Jay)
- SDR Raven class 0-4-0ST (1875 - 1892)
- John Gray
- GWR Hawthorn class 2-4-0 (1865 - 1876)
- Juno (Roman mythology Juno)
- GWR Banking class 0-6-0ST (1852 - 1872)
- SDR Dido class 0-6-0ST (1864 - 1884)
- Jupiter (Roman mythology: Jupiter)
- GWR Fire Fly class 2-2-2 (1841 - 1867)
- Juvenal (Roman personality: Juvenal)
- GWR Bogie class 4-4-0ST (1854 - 1873)
Read more about this topic: List Of Broad Gauge (7 Feet) Railway Locomotive Names