That's all very helpful. Thanks for helping me out. 
 Is there anything more you think I should know about transportation in Wales today? 
 Historically in Britain, the words were not restricted to modern Wales or to the Welsh but were used to refer to anything that the Anglo-Saxons associated with the Britons , including other non-Germanic territories in Britain (e.g. Cornwall) and places in Anglo-Saxon territory associated with Britons (e.g. Walworth in County Durham and Walton in West Yorkshire). 
 I didn't know there were six of them. What can you tell me about the etymology? 
 My pleasure. Have a good evening.
Historically in Britain, the words were not restricted to modern Wales or to the Welsh but were used to refer to anything that the Anglo-Saxons associated with the Britons , including other non-Germanic territories in Britain (e.g. Cornwall) and places in Anglo-Saxon territory associated with Britons (e.g. Walworth in County Durham and Walton in West Yorkshire).