The History of Railroads
The first railroads, which were only a few miles long, grew until they eventually spanned the continent. Whether they were large or small their pattern was very much the same. The great iron horses followed routes worn earlier by four-legged horses and even earlier by parties of Indians. These pathways were mostly determined by geography, because man has always sought the easiest route to travel. He has found his way across plains and along meandering streams. When confronted by mountains, he has preferred to discover a pass rather than to ascend the peaks or to bore this way through them. In that sense we can say that the routes of our railroads were determined to a large extent before man ever existed.
The cars of the first crude trains, used before the War of 1812, were drawn by horse. These early railroads served only local needs. Sometimes they were used in connection with canals; on other occasions they performed various transportation chores for local mines or factories. They did little or nothing to meet the needs of people who wished to travel. The first successful use of steam to move trains was achieved in England in 1829. A locomotive invented by George Stephenson made history when it hauled a train at the rate of 15 miles per hour. Trains were first moved by steam over American railroads inl830. By that date the Baltimore and Ohio Railroad had completed construction of its tracks from Baltimore to Ellicotts Mills, a distance tof about 13 miles. The famous locomotive Tom Thumb made the trip in one hour. Other experiments proved successful about the same time. The Mohawk and Hudson Railroad built tracks between Albany and Schenectady using another famous locomotive, named the De Witt Clinton , which had been built in New York State. It completed a successful trip in 1831 and at times achieved a speed of 30 miles per hour. Another notable achievement was accomplished by the Philadelphia, Germantown and Norristown Railroad in 1832. This railroad used still another famous locomotive named Old Ironsides , which had been built in the foundry of M. W. Baldwin at Philadelphia. It not only reached but maintained a speed of 28 mile per hour. By 1840 there were 2,818 mile of railroad tracks in the United States.
【四级冲刺练习阅读(161)】相关文章:
★ 六级经典的阅读7
★ 六级经典的阅读3
最新
2016-10-18
2016-10-11
2016-10-11
2016-10-08
2016-09-30
2016-09-30