I think perhaps what the parent comment meant was more that trains aren't inhibited by normal traffic lights; upon approaching a crossing with a road, the train

I think perhaps what the parent comment meant was more that trains aren't inhibited by normal traffic lights; upon approaching a crossing with a road, the train is immediately given the right-of-way — i.e., the lights activate, the gates close, the cars stop and allow the train to pass. True, there is a separate signal for the train, though it's more if the train(s) ahead of it are keeping to schedule than the train itself. (Rush-hour trains here are regularly delayed due to the train ahead of the one I tend to ride being so delayed.)