Select the correct text in the passage.
What evidence supports the inference that George Stephenson's development of the steam engine was made possible by the inventions of
James Watt?
The Steam Engine
Before the time of Watt, the steam engine was exclusively a steam pump-slow and wasteful of fuel. Watt made it a quick, powerful, and efficient
engine, requiring only a fourth as much fuel as before. Under his first patent, the engine was still used only as a steam pump, but his later
improvements adapted it for driving stationary machinery of all kinds. The commercial success of his engine was soon fully established.
George Stephenson further modified Boulton and Watt Company's creation. Stephenson initiated the use of steam for carrying passengers and goods.
In September 1825, the first train passed over the road. It consisted of thirty-four cars weighing, all told, ninety tons. The train was pulled by
Stephenson's engine, operated by Stephenson himself, with a signalman riding on horseback in advance. The train moved off at the rate of ten or
twelve miles an hour, and on certain parts of the road it reached a speed of fifteen miles per hour. The trial was a complete success.