There was a crooked man and he walked a crooked mile, He found a crooked sixpence upon a crooked stile. Once there was a big turntable bridge which spanned a large river. During most of the day the bridge sat with its length running up and down the river parallel with the banks, allowing ships to pass through freely on both sides of the river. But at certain times each day, a train would come along, and the bridge would be turned sideways across the river to allow the train to cross.

A switchman sat in a small shack on one side of the river where he operated the controls to turn the bridge and lock it into place as the train crossed. One evening as the switchman was waiting for the last train of the day to come, he looked off into the distance through the dimming twilight, and caught sight of the train's light. He started the controls and waited until the train was within a prescribed distance when he was to turn the bridge. He turned the bridge into position for the train to cross, and moved the lever to lock the bridge into position, but to his horror, he found the locking control didn't work. If the bridge was not securely locked into position, it wobble back and forth at the ends when the train came onto it, causing the train to jump the track and go crashing into the river. This would be a passenger train with many persons aboard.

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