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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.
