How To Crush a Penny for Free!

My kids love to spend money on the machines that crush a penny.  Well, our latest camp has a railroad track.....a working railroad RIGHT behind us (like 10 feet behind the RV spot).  It has active trains several times a day AND night, which have caused Matt and I a few nights of little sleep.  The kids, however, love the idea of crushing pennies on the train track (totally Matt's idea, Dad). 

Step 1:
Put the penny on the track.

Step 2:  Listen for the train.

Step 3:  Wait for train.  After it passes, hunt down the penny!

The penny machines have nothing on this.  Goodbye, penny machines, goodbye.