Transport Fever 2 USA Railroad Crossing and Bus Traffic 

I really like the detail when you’re zoomed in like that. I play a lot of cities skylines and I love just sitting there and watching traffic and trains go by

Just a tip, to have high speed trains you need to avoid railroad crossings as much as possible. Build tunnels and bridges on a dead straight route.

Thats some amazing vehicle variety. If I had a good PC i'd play this nonstop.