Ok I decided since... well something like 10 year or so to play sme TTD. Hey how cool is that, I actually got t runnin, everything is nice and all... BUT.
Am I freaking stupid, have lost all my brains or why the heck it took me like 15 hours to realize that if I build train depot at the end of station my trains auto repair... I make same way ship depot at the beginning of every dock, and Woohoo autorepair.... But how the HECK I repair my plains and helicopters and cars?
Your vehicles will automatically seek out a depot to service themselves every so often. The default values are every 150 game days for road vehicles and every 100 days for aircraft.