Triumphs and wonders of the 19th century, a volume of original, historic and descriptive writings showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress (1901)
Boyd, James Penny, 1836-1910 · Philadelphia, A. J. Holman & co · leaf 696
station in advance. This was the beginning of the block system, which is a great element in the safe operation of traffic, sinceit maintains an interval of space between trains. Mr. Edwin Clarks tele-graph block system was introduced in 1853, and as traffic increased interme-diate block signal… … AN AMERICAN EXPRESS LOCOMOTIVE. first held that it was not adapted to conditions in this country, where somany lines have but a single track, but experience has shown that it increasesthe facility as well as the safety of operating traffic on single and doubletrack lines alike. Steam locomotives…
Progress · Inventions
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