There was once a bridge which spanned a large river. During most of the day the bridge sat with its length running up and down the river
paralleled with the banks, allowing ships to pass thru freely on both sides of the bridge. But at certain times each day, a train would come along and the bridge would be turned sideways across the river, allowing a train to cross it.
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 thru the dimming twilight and caught sight of the train lights. He stepped to the control and waited until the train was within a prescribed distance when he was to turn the bridge. He turned the bridge into position, but, to his horror, he found the locking control did not work. If the bridge was not securely in position it would 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 TÜRKÇE YAZIN