Steam Locomotive: A steam locomotive is a type of train that uses steam power to generate motion. It played a crucial role in the development of railroad transportation.
Transcontinental Railroad: The transcontinental railroad was a railway line that spanned across the United States, connecting the East Coast with the West Coast. Its completion had significant economic and social impacts.
Gauge: Gauge refers to the width between the rails on a railway track. Standardizing gauge size was important for ensuring interoperability between different rail systems.