Jonathan H. Grossman is publishing a book through the Oxford University Press on 1 March. It's called Charles Dikens's (sic) Networks and is an analysis of how the novels were impacted upon by the advent of modern transport methods such as the stagecoach, the train and the steam ship.

Incidentally the above link also has -courtesy of the OUP- a free link to Charles Dickens' entry in the Oxford Dictionary of National Biography.