The economics of the Island of Sodor as shown in Thomas the Tank Engine don't make a lot of sense.

But Awdry himself admitted that Sodor was an afterthought. In 1950, he writes in The Island of Sodor, after his first four Railway Series books had been written, that he was poring over maps to ...

However, ordinary maps say it goes only to Walney Island. So when you have crossed the bridge, instead of Vickerstown on Walney, you are in "Vicarstown" - gateway to Sodor.