Cardiff in making iron and later steel, brought to the sea by packhorse from Merthyr Tydfil. This was first achieved by the construction of a long canal from Merthyr (510 feet above sea-level) to the Taff Estuary at Cardiff. Eventually the Taff Vale Railway replaced the canal barges and massive marshalling yards sprang up as new docks were developed in Cardiff – all prompted by the soaring worldwide demand for coal from the South Wales valleys. At its peak, Cardiff's port area, known as Tiger Bay, became the busiest port in the world and – for some time – the world's
Cardiff Bay railway station Cardiff Bay railway station Cardiff Bay railway station (), formerly "Cardiff Bute Road", is a station serving the Cardiff Bay and Butetown areas of Cardiff, Wales. It is the southern terminus of the Butetown Branch Line 1 mile (1.5 km) south of . Only one platform is now in use. The station building remains disused and is boarded up. The station building lies on Bute Street, although the rest of the station remains visible from the nearby Lloyd George Avenue. For various reasons, including it being the origin of the first steam-powered passenger train service in Wales, the station is