Trivially different, but with a bit different scan:

Passengers will please refrain
From using toilets while the train
Is standing in the station -
................we thank you.
Constipation's recommended
While the train is being tended
If the train can't go
Then why should you.

And the non-train bit:

Nothing looks much better
Than a young girl in a sweater
But the sweater may not be what it appears.
Boys, it's recommended
That you see what's in the sweater
Or your wedding night could end in bitter tears.

John