Note 16 — RAILWAY MANAGEMENT.
Reading edition
Of course, this "stringing" of an extra train is not always done in actual operation. Practice and experience will give as wonderful expertness to a train-despatcher in handling trains "in his head" as to a mathematician in solving problems, and often all trains on a road will be handled entirely "by order," or as extras. But the example given illustrates the principle upon which expert practice is based.