Good point! You could have engines on the front and back cars, approaching a stop could make trailing cars apply slight breaking to create separation between t

Good point! You could have engines on the front and back cars, approaching a stop could make trailing cars apply slight breaking to create separation between them when going over 'router' tracks, allowing leave the train and new cars to enter in the gaps, then back engine could accelerate gradually to unify the train before switching main power back to front car. This would be really fun to watch in action.