I came across this great app called Aubin, "an autism friendly travel companion".
The main purpose is it's a journey planner.
You can tell it things like how much you prefer different kinds of transport, how much time you want to wait at a station, whether you'd prefer a single longer journey to having to board multiple times, and so on.
There are different colour schemes (even ones adapted for particular kinds of colourblindness!) and you can decide how delays are displayed.
And there's an "autism card" which can show some prepared text when you're having a meltdown, along with a text to speech thing and emergency contacts.
I'm so impressed.