An unscheduled train approaches the platform,

some say that it brings passengers back to their past.

But there are three rules that one must follow while travelling:
 

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

2. Passengers are required to stay within the carriage.

3. Passengers must return to their assigned seat before the final arrival.
 

You cannot alter the present.

You may return only for a moment

—perhaps to say the unsaid or to see someone you can no longer reach,

one last time.

When the bells ring and the doors close, what will you gain from this journey?

And what will you leave behind?