I vote up for this one. Definitely this micro-management of replacing the old vehicles just ruins all the fun of the game. I have to put a speed on slow and wait for 10 minutes until 4 carriages number 1, 10,12,17 from the green line reaches the depot to replace them, then the same procedure for carriages number 2,3,4, 11,21,41,45 from the red line, then for the carriages 5,6,7,65,66,67,98,105 from the pink line and so on… so I stopped at 10% of what needs to be done to post my frustration about it here.
For The Attention of Devs:
Please, can you shunt the ageing of the vehicles on the next patch until you find something more sophisticated to this issue. Thank you.