It's something of a homage to classic transport simulation games, like Sid Meier's Railroad Tycoon and 1994's Transport Tycoon.
Train Fever was originally crowd-funded , which I have genuinely never heard of. Interestingly, it starts in 1850 and continues on to the present day, which means aficionados of both steam trains and modern electric trains should find something they like.
Another selling point is that there's no grid that game objects have to be aligned to, which should make building your railways a bit less restrictive. Cities will also evolve dynamically over time, developing from small turn of the century town and villages into bustling modern cities.
You can pre-order Train Fever for a 10% discount, which adds up to Â£24.29.