Railroad lines on important stretches are often double tracked. 'This facilitates the movements of commerce and lessens the danger of collisions. In the vicinittj of important cities the tracks are not only double. but are multiplied many times. A modern railroad slvi{ch· yard ;s a confusing maze of tracks. switches, and sifJnal lights. Train crews of many years ' experience find that entering terminal stations of our great cilies IS a difficult task , one that calls for ex - perienced judgment , cool heads. keen eyes, and steady hands. erg anizations
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