Maybe someone asked this before, but I notice quite some resemblance between “Train Fever” and a 2002 Ubisoft simulation called “Trains&Trucks Tycoon”. I still own that game and I played a lot with it.
It’s not pure coincidence. Basically, the people of Trains & Trucks Tycoon targeted the same goal as we do: Develop a modern-day transport tycoon in 3D and without a grid.
Unfortunately, their publisher Ubisoft forced them in 2002 to publish the game in an unfinished state. After that, there was a long law suit which the was finally won by the Trains & Trucks Tycoon people in 2009.