What lesson is the railroad era in middle school history

Junior high school history 9th grade, unit 7 knowledge.

In the early 1800s, "railroads" were already being built to transport goods. At that time, the tracks were wooden and the carriages were pulled by horses.In 1825, a steam train designed by Stephenson carried 450 passengers at 24 kilometers per hour, marking the beginning of the railroad era.After 1830, the United Kingdom set off a frenzy of investment in the construction of railroads, and by 1851, the United Kingdom had built a railroad network with a total length of about 10,000 kilometers. The arrival of the railroad era for the community to provide a faster, cheaper and more convenient transportation, so that the link between production and the market has become closer.