In the same way that passengers automatically have randomly changing outfits, I would like to suggest that this feature would be good in implementing weathering layers on trains. Each time you drive a train, the weathering would be randomized and slightly different each time, sometimes subtle, sometimes heavy and everything in between. This would also apply to AI trains as well. I think this would bring much immersion to the game, thank you.
Oh yes, this is needed. It’s very noticeable how there is a line of symmetry in the dirt and grime on the 387 and 377. It’s very off putting. and on the same route you arrive at Victoria only to find the exact same spray of mud on the neighbouring unit. It would also help show variety in when the vehicle was last washed down.