On a hidden platform, a train waits—one that appears on no schedule.

Some say that if you board it, you can travel back to the past.

But you must follow three rules that cannot be broken:
 

1. The ticket is valid for one journey only.Re-entry is not permitted.

2. Passengers are required to stay within the carriage.

3. You must return to your assigned seat before the final arrival.
 

You cannot alter the present.

You may return only for a moment

—perhaps to speak words left unspoken,or to see someone, one last time.
 

When the bell rings and the doors close, what will you gain from this journey?
And what will you leave behind?