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Doctor's Bridge or Machine Bridge at Pontypridd
This three-arched stone viaduct over the River Taff carried Dr. Richard Griffiths' Tramroad connecting collieries in the Rhondda Valley, via the Doctor's Canal with the Glamorganshire Canal. A weighing machine for coal trams was installed nearby hence the local name given to the bridge.
This has been extensively remodelled and now carroes one carriageway of a road,