Travelling one day by express from Perth to Edinburgh, on a sudden we came to a dead stop, because a very small screw in one of the engines—every railway locomotive consisting virtually of two engines—had been broken, and when we started again we were obliged to crawl along with one piston-rod at work instead of two. Only a small screw was gone. If that had been right the train would have rushed along its iron road, but the absence of that insignificant piece of iron disarranged the whole. A train is said to have been stopped on one of the United States’ railways by flies in the grease-boxes
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