as I said the game should replace old vehicles automatically when that line has surplus money.
There should also be a way to send money from the central budget and boost the lines own budget.
I don’t feel smart when I repetitively sit and click on each vehicle. Things that the game should do automatically.
If I am the CEO or chief engineer / designer I do not take my car and drive down and point at the trains the service people should upgrade. If so I would never have time to do the strategic stuff of planing where the next lines should go or if I am going to shut a line down.