Hello all,
I've been thinking for a while now that it might be a good idea to add a new building for every service that acts as a workshop where you can store vehicles which have been replaced at stations but don't need to be deleted and bought again in the near future. It would also add a bit of realism in my opinion.
I kow nothing about programming but it might open up options for vehicles to break down when heading to calls and having to be recovered and sent to the workshops, where spare appliances are kept.