Since you've used it and aware of it now, I'll share a story with you.
A guy walks to me and asks whether the platform we were in was for Jable Ali, I said yes. He then asks which train compartment he can get into. I said, which ever, they all go the same way. Still puzzled, he asks if there was any restriction on getting into any of these, I said no restriction and pointed at Gold & ladies only compartment and explained to have restriction. I think he was too smart to understand, shook his sideways as in affirmative and went straight inside Gold compartment. Remember, he had RED ticket, not Gold, Silver nor Blue.
Now don't say he was smart enough, he looked as dumb as he could have been.