What was the rail center of the west in the mid 19th century?

In the mid-19th century, the rail center of the West was primarily centered around Chicago, Illinois. As a major hub for several railroad lines, Chicago facilitated the movement of goods and people across the expanding United States. The city's strategic location allowed it to connect the East with the West, playing a crucial role in the westward expansion and economic growth during this period. Additionally, the completion of the transcontinental railroad in 1869 further solidified its importance in the national rail network.