As the engine took water, there was time to think of the curious turn of events that brought the North British (in the thin disguise of "Border Counties Railway") over the border, down the North Tyne to Hexham, and eastward from Reedsmouth by the Wansbeck Valley line to Morpeth (and Rothbury), though some of the emptiest parts of one of the emptiest counties of England.
Source: wiktionary