Railway Empire is a new game about railway transportation. They are in (paid with discount) beta testing now in Steam. It will be released for Linux+Windows, although the beta is only available for Windows. It's a little pricey, even with the discount (40-50 euros).
It mostly seems a Railroad Tycoon clone. It has some business part and some other details that appeared in those games: sand towers, breakdowns, etc.
It will be released at the end of January.