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Dice & boxcars

Posted by Elith Chen on April 29, 2001

I met a line in READER'S DIGEST: 'You roll the dice and they come up boxcars'. Does anyone know what this means?
The context is: the speaker's daughter will soon lose her eyesight due to some inborn disease. So he drives the little girl everywhere to let her see as much things as possible before she can't see anything... I'm not sure if the father is using this line to express his deep sadness.
What precisely does it mean?
Thank you!