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.

Barry Railway - Inc 1884 ~ Opd 1888 ~ Amgd 1922

*Bute Docks - Inc 1886 ~ Opd 1911 ~ Amgd 1922

Port Talbot Railway & Docks - Inc 1894 ~ Opd 1897 ~ Amgd 1922

Burry Port & Gwendraeth Valley Railway - Inc 1865 ~ Opd 1869 ~ Amgd 1922

The Rhymney Railway - Inc 1854 ~ Opd 1858 ~ Amgd 1922

Lampeter, Aberayron & New Quay Light Ry - Inc 1906 ~ Opd 1911 ~ Amgd 1922

Penearth Harbour, Dock & Ry - Inc 1856 ~ Opd 1859 ~ Amgd 1922

Cleobury Mortimer & Ditton Priors Light Ry - Inc 1901 ~ Opd 1908 ~ Amgd 1922

Rhondda & Swansea Bay Railway - Inc 1882 ~ Opd 1885 ~ Amgd 1922

Ross & Monmouth Ry - Inc 1868 ~ Opd 1873 ~ Amgd 1922

Princetown Railway - Inc 1878 ~ Op 1883 ~ Amgd 1922

Vale of Glamorgan Ry - Inc 1889 ~ Opd 1897 ~ Amgd 1922

West Somerset Ry - Inc 1857 ~ Opd 1867 ~ Amgd 1922

Wrexham & Ellesmere Ry - Inc 1885 ~ opd 1895 ~ Opd 1922

Oswestry & Newtown Ry - Inc 1855 ~ Opd 1860 ~ Amgd 1922

Oswestry, Ellesmere & Whitchurch Ry - Inc 1861 ~ Opd 1863 ~ Amgd 1922

Llanidloes & Newtown Ry - Inc 1853 ~ Opd 1859 ~ Amgd 1922

Newtown & Machynlleth Ry - Inc 1857 ~ Opd 1863 ~ Amgd 1922

The Cambrian Railway - Inc 1864 ~ Amgd 1922

Aberystwith & welsh Coast Ry - Inc 1861 ~ Opd 1863 ~ Amgd 1922

Mid Wales Railway - Inc 1859 ~ Opd 1864 ~ Amgd 1922

Vale of Rheidol Railway - Inc 1897 ~ Opd 1902 ~ Amgd 1922

Tanat Valley Light Ry - Inc 1898 ~ Opd 1904 ~ Amgd 1922

The Brecon & Merthyr Railway - Inc 1859 ~ Opd 1875 ~ Amgd 1922

Swansea Harbour Trust - Inc 1854 ~ Opd 1852 ~ Amgd 1923

Swindon, Marlborough & Andover Ry - Inc 1873 ~ Opd 1881 ~ Amgd 1923

Swindon & Cheltenham Ext Ry - Inc 1881 ~ Opd 1883 ~ Amgd 1923

Midland & South Western Junc Ry - Inc 1884 ~ Amgd 1923

Marlborough & Grafton Ry - Inc 1896 ~ Opd 1898 ~ Amgd 1923

Gwendraeth Valleys Railway - Inc 1866 ~ Opd 1871 ~ Amgd 1923

Penarth Extension Ry - Inc 1876 ~ Opd 1878 ~ Amgd 1923

Forest of Dean Ry - Inc 1856 ~ Opd 1868 ~ Amgd 1923

Van Railway - Inc 1873 ~ Opd 1871 ~ Amgd 1923

Didcot, Newbury & Southampton Ry - Inc 1873 ~ Opd 1882 ~ Amgd 1923

Exeter Railway - Inc 1883 ~ Opd 1903 ~ Amgd 1923

Teign Valley Ry - Inc 1863 ~ Opd 1882 ~ Amgd 1923

South Wales Mineral Railway - Inc 1853 ~ Opd 1860-62 ~ Amgd 1923

Mawddwy Railway - Inc 1865 ~ Opd 1865 ~ Amgd 1923

Llanelly & Mynydd-Mawr Railway - Inc 1875 ~ Opd 1883 ~ Amgd 1923

Liskeard & Looe Ry - Inc 1825 ~ Opd 1879 ~ Amgd 1923

Welshpool & Llanfair Railway - Inc 1899 ~ Opd 1903 ~ Amgd 1923

Powlesland & Mason - Inc 1865 ~ Amgd 1924

*Corris, Machynlleth & River Dovey Tramroad - Inc 1858 ~ Opd 1859 ~ Amgd 1930

Midland & South Western Junction Railway

Neath & Brecon Railway

Weston, Clevedon & Portishead light Railway - Inc 1885

Wantage Tramway