Part 2/12:
Imagine a single machine moving roughly 10,000 tons—equivalent to 5,000 cars—over countless miles every day. The typical locomotive weighs about 370,000 pounds and is capable of pulling a train that can surpass 20 million pounds. This begs the question: How does a machine that weighs less than half a million pounds exert enough force to move such an immense weight without the wheels just spinning on the tracks?