The industries themselves were intimately linked with historic transport systems and routes, which provided a web of local and more distant connections.
Cafodd y diwydiannau eu hunain eu cysylltu yn y pen draw â systemau a llwybrau trafnidiaeth hanesyddol, a ddarparai rwydwaith o gysylltiadau lleol a chysylltiadau ymhellach i ffwrdd.