The locomotives of the old Great Western Railway Company were, in the main, constructed at either Swindon or Wolverhampton workshops, to the design of the six successive engineers, Gooch, Armstrong, Dean, Churchward, Collett and Hawksworth. However, many other strange locomotives found their way on to the Great Western stock lists due to the addition of the Welsh companies and other small lines of the British Iles.

Worchester, Bromyard & Leominster Ry - Inc 1861 ~ Opd 1874 ~ Amgd 1888

Leominster & Bromyard Railway - Inc 1874 ~ Opd 1884 ~ Amgd 1888

Kingsbridge & Salcombe Railway - Inc 1882 ~ Opd 1893 ~ Amgd 1888

Cornwall Railway - Inc 1846 ~ Opd 1859 ~ Amgd 1889

Llanelly Railway & Dock - Inc 1828 ~ Opd 1833 ~ Amgd 1889

Whitland & Cardigan Ry - Inc 1869 ~ Opd 1873 ~ Amgd 1890

Witney Railway - Inc 1859 ~ Opd 1861 ~ Amgd 1890

East Gloucestershire Ry - Inc 1862 ~ Opd 1873 ~ Amgd 1890

Wellington & Severn Junc Railway - Inc 1853 ~ Opd 1857 ~ Amgd 1892

Calne Railway - Inc 1860 ~ Opd 1863 ~ Amgd 1892

Ross & Ledbury Railway - Inc 1873 ~ Opd 1885 ~ Amgd 1892

Newent Railway - Inc 1873 ~ Opd 1885 ~ Amgd 1892

East Usk Railway - Inc 1885 ~ Opd 1898 ~ Amgd 1892

Oldbury Railway - Inc 1873 ~ Opd 1884 ~ Amgd 1894

Tiverton & North Devon - Inc 1875 ~ Opd 1884 ~ Amgd 1894