Jericho is about building the Ribblehead Viaduct on the Settle to Carlisle railway. Hundreds of navvies lost their lives building it in the 1870s.
There were other settlements called Inkermann, Sebastapol, Belgravia and even Salt Lake City, all within half an hour's wade through the bogs. The navvies were housed three or four hundred to a settlement.
If you can get hold of a copy of the Dalesman, there is an article about the real Jericho, and about how they lived and died.
It's from an article printed in Chambers's Journal in 1873.