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Description
Here is a locomotive equipped with anti-friction roller bearings.
And here are some girls. Yes, this is only just the start.
Whenever you're testing the anti-friction bearings, you need less power to start, less power to keep going.
Four young women - together they weigh 410 pounds. A titan of the rails weighing in at 448 US Tons.

Before the anti-friction bearing, you could've powdered the track with husky men, tugging and straining. If they can't, they wouldn't be able to move such hefty machine.
But, look at this.

Description
Here is a locomotive equipped with anti-friction roller bearings.
And here are some girls. Yes, this is only just the start.
Whenever you're testing the anti-friction bearings, you need less power to start, less power to keep going.
Four young women - together they weigh 410 pounds. A titan of the rails weighing in at 448 US Tons.

Before the anti-friction bearing, you could've powdered the track with husky men, tugging and straining. If they can't, they wouldn't be able to move such hefty machine.
But, look at this.