The Cambrian Coast Express is an old named passenger train of the Great Western Railway (GWR), and later British Rail, running from London Paddington via Shrewsbury to Aberystwyth and Pwllheli over the Cambrian Line.

Prior to amalgamation with the GWR in 1923, the line beyond Buttington Junction near Welshpool was owned and operated by the Cambrian Railways and passengers from England normally changed to a Cambrian Railways train at Shrewsbury. But in July and August 1921, the GWR ran a daily through express from Paddington to Aberystwyth and Pwllheli.

The first official use of the name Cambrian Coast Express was in 1927 when the train ran only on summer Fridays and Saturdays. By 1939 the through train was running only on summer Saturdays. It left London Paddington at 10:20 with calls at Leamington Spa, Birmingham Snow Hill, and Wolverhampton Low Level which was reached at 12:44. Here, owing to weight restrictions over the Cambrian line, the GWR Castle Class 4-6-0 locomotive was changed for two GWR Duke Class 4-4-0 engines or for a GWR Manor Class 4-6-0 for the non-stop run to Welshpool using the Shrewsbury Abbey Foregate curve (to avoid a stop and reversal of direction at Shrewsbury). Beyond Welshpool, calls were made at Machynlleth, Dovey Junction and Borth to reach Aberystwyth at 15:55, a total of 5 hours 35 minutes for the 235-mile (378 km) journey from London. In the reverse direction the journey was 25 minutes longer, at six hours; departing Aberystwyth at 10:00 with an additional stop at Newtown, but with otherwise unchanged station calls, and locomotive change at Wolverhampton. The train became the 14:00 departure from Birmingham to arrive at Paddington at 16:00.^[1]

After World War II, the Cambrian Coast Express was re-introduced on Saturdays only and its seasonal operation continued under British Rail, usually with through coaches to both Aberystwyth and Pwllheli. By 1957 it was running every day except Sundays all year round. During the summer timetable, it was usually hauled by a "King" class locomotive as far as Wolverhampton where there would be an engine change, usually to a "Castle" class locomotive which took the train on to Shrewsbury where there was a second engine change as Castles were outside the loading gauge for the Cambrian line.

Two engine changes in such a short distance was obviously inefficient and following gauge testing with 6006 "King George I" in the spring of 1958, a King worked the train through from Paddington to Shrewsbury from the start of the 1958 summer timetable. At Shrewsbury the train would be split into two sections, one for Aberystwyth and one for Pwllheli. The King would return to Paddington with one of the regular Birkenhead-Paddington expresses later that afternoon.

In the up direction, the two sections would run independently as far as Wolverhampton, with the Pwllheli section using the Abbey Foregate triangle to omit the stop at Shrewsbury. The two sections would then be combined at Wolverhampton. The motive power for each of the two sections was usually a "Manor" class 4-6-0 or "Dukedog" 4-4-0, the latter of which were often double-headed.

The winter timetable arrangements were similar, except that following the arrival of the King with the down train at Shrewsbury, some coaches would be detached and the train taken forward as far as Machynlleth before being divided. These arrangements were mirrored for the up train with a Castle taking the train through from Shrewsbury to Paddington.^[2]

The train last ran in 1991,^{[citation needed]} by which time it had long since transferred its London terminus to Euston, operating as an extension to the regular-interval service over the West Coast Main Line between London and Wolverhampton. In the winter 1989-1990 timetable, it left London at 15:40, arriving Aberystwyth 21:00; the return working left Aberystwyth at 07:13, arriving London Euston at 12:24. There were no longer any through coaches to the northern part of the Cambrian Line: passengers for stations to Pwllheli had to change at Machynlleth.^[3]

The Cambrian Coast Express name was revived in summer 2006 by Arriva Trains Wales, as a tourist steam service which ran from Machynlleth to Porthmadog or Pwllheli. In 2007, it was taken over by West Coast Railways and rebranded The Cambrian. In 2010 it was cancelled by Network Rail due to the installation of a trial signalling system ERTMS.^{[citation needed]}

• List of named passenger trains of the United Kingdom

Wikimedia Commons has media related to Cambrian Coast Express.

• The Cambrian at the West Coast Railways