evaluate how to get bidirectional trips

[carocad]

From what I can see in kamal routing the trips that are being generated here are only in one direction. For example

• route: bus 51
• long name: Flughafen to Hauptbanhof

However, the route must obviously have a way back, otherwise it would be a black hole 😄

The problem that I see is that although reversing the stops is easy, the name of the route and trips are not so straightforward to reverse since those are random strings without a specific format.

This ticket to both evaluate how would a solution for that look like and about its implementation