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There are two different types of carriage. One is for women and children only, the other is for anyone at all. Which means a woman can sit in the same carriage as a man, but the man cannot return the favour. So if you are waiting on the platform and you see nothing but women when the door opens, rush to the next carriage before the doors close (if you are a man, that is). Or wait for the next train; they are frequent.