Remember in physics they used to explain why metal expansion caused them to leave those gaps in the rails, which made the nice clickety-click noise. So it was kind of confusing when they started using long lengths, and the noises didnt happen any more. "But you told us there had to be gaps" we complained."No,we've abolished all that" they said.
Well,according to the news today, we were right and they were wrong. It's got hot, and all the rails are buckling. Ha Ha!