| GOOCH | First Locomotive Superintendent of the GWR (5) |
| ADAMS | William _, Locomotive Superintendent of the North London, GER and LSWR (5) |
| NORTHSTAR | Stephenson built 2-2-2, first engine of the GWR (5,4) |
| DEAN | William _, Chief Locomotive Engineer of the GWR, 1877-1902 (4) |
| STEAM | Hazy vapour depicted in painting by J. M. W. Turner of a landscape including the GWR bridge at Maidenhead (5) |
| WHALE | George _, LNWR Locomotive Superintendent who succeeded Webb (5) |
| GERARD | Originally a barber-surgeon, the botanist and superintendent of the gardens of William Cecil, Lord Burghley and compiler of the tome Herball (6) |
| PAXTON | Superintendent of the gardens at Chatsworth where he cultivated and developed the Cavendish banana, later designing the Crystal Palace and Mentmore Towers (6) |
| STURROCK | First Superintendent of the GNR, designed 7ft. 2-2-2s (8) |
| ROBERTELEE | 1850s Superintendent of the US Military Academy at West Point |
| CHURCH | Place of worship linked to Collett's predecessor on the GWR (6) |
| GNAT | Insect providing the GWR telegraphic code for a slip coach (4) |
| SCOTSMAN | Flying -, Sir Nigel Gresley's LNER Class A3 that was the first locomotive to clock 100 mph and the first to circumnavigate the globe (8) |
| TAMAR | GWR Ariadne class locomotive terminates in the English Channel (5) |
| KIRTLEY | Matthew, First Locomotive Engineer of the Midland Railway [appointed 1844] (7) |
| ELDON | Earl of ___, GWR 'Castle' No 5055 (5) |
| FORTH | GWR Ariadne class locomotive terminates on Scotland's east coast (5) |
| CLYDE | GWR Ariadne class locomotive terminates on Scotland's west coast (5) |
| EMLYN | Newcastle ___, terminus of a GWR branch from Pencader (5) |
| DUCIE | Earl of ___, GWR No. 5054 (5) |
