The Great Train Robbery
This is a very silly 1978 film starring Sean Connery and Donald Sutherland, directed by Michael Crichton, about a Victorian plan to rob a moving train for the first time. Full of con-men, double-dealing and all sorts of naught behaviour. And Sean Connery being all hunk-worthy, and Donald Sutherland trying to do an Irish accent and failing completely. And Lesley-Anne Down being the love interest/female con artist.
Look, it's not quite steam-punk or The League of Extraordinary Gentlemen, but it's clearly a forerunner of That Sort Of Thing, and as such wonderfully daft telly to watch of a Saturday evening with a bowl of popcorn and good friends from university, which is precisely what I did last weekend. So there.