Beginning of Essay
In the beginning of transportation there were mainly horse and buggy, but then they developed a steam engine and they develop canals for steam boats. About five years later the people decided to start railroads because it was easier to lay and could be lain almost ....

Middle of Essay
.... the 's puffing. Valve gearing plays a major role in the steam because a wide range of effect is required of the engine. If the load on the engine is increased, The engine would tend to slow down. The engine governor moves the location of the eccentric in order to increase the length of time during which steam is admitted to the cylinder. As more steam is admitted, the engine output increases. The efficiency of the engine decreases, however, because the steam no longer expand fully. Some steam s weigh 500 tons(450 metric tons) or more and can develop more than 6,000 horsepower. They can pull a long train or a passenger train at about 100 miles(160 ....