Coins getting flattened by a train passing over them usually brought older kids telling the younger kids to stop doing it because you could tip the train off the tracks. The kids I hung out with didn't buy it and continued to place their coins on the tracks. I never once witnessed a train tipping off the tracks. However, I did see quite a few pennies, nickels, dimes and quarters get flattened and elongated and turned into useless pieces of metal. Of course, a Hershey bar back then was 10¢ and not $2.99 and a new car was under $2,000.00 the times have sure changed.