As new vehicles, new training, new jobs and playstyles come out the vehicles that are in old stations may need to be changed. If you have a station that has say 20 vehicles and you have to manually open a new tab and delete each vehicle it can take a while and it becomes signifacntly longer if you have a lot of stations that need changing. At the minute it's either delete the whole station and start again or go through and delete each vehicle one at a time, what I am suggesting is a button to delete all vehicles in the station at the same time and allow players to clear and start over.