The Pontypool and Blaenavon Railway (Welsh: Rheilffordd Pont-y-pŵl a Blaenafon) is a 3.5-mile (5.6 km) volunteer-run heritage railway in South Wales, running trains between a halt platform opposite the Whistle Inn public house (famed for its collection of miners' lamps) southwards to the town of Blaenavon via a two-platform station at the site of former colliery furnace of the Big Pit National Coal Museum. The line is the highest preserved standard-gauge line in the United Kingdom, and also uniquely having the only standard-gauge rail-over-rail bridge within preservation.