I know, I know: It's too expensive to fully simulate the physics of all AI trains in the game. No need to convince me of that. But what about simulating the full physics on AI trains as long the player is onboard? The player can only ever be onboard one AI train, and while doing so, she can't at the same time drive a player train of her own, so there would still only ever be the need to simulate the full physics on one train. It would be neat to be able to sit on the secondman's seat, watch the controls and "learn" from AI how it's done Approaches at stations and sounds should also benefit in terms of realism.