[2020] Railroad Question

It depends on how you do it. Banning trucks with TMPE could work. What you don't want is to completely disconnect the airport from the rest of your city, as that will cause problems with service vehicles. The game doesn't really understand that things can be unreachable and will try to spawn things that can never get to their destination.

Though if your setup is efficient, then you shouldn't have too many trucks spawn. The game will always send things through the fastest route - so as long as rail is faster, it will be used. Since trains have higher speeds, it's often about making the rails fairly direct, then they become the most efficient way to transport goods. :)

Originally posted by Coookyman: There are 2 ways to make one route the fastest:
a) make it shorter or faster.
b) or you could make the alternative through route (probably that's useing trucks on your streets) more unattractive. e.g. by lowering speed limits.

^ This. The easiest to do is definitely a) where you just make more direct or faster routes, but changing speed limits on roads can also help (when there aren't a lot of other faster routes than the one you want them to use).