Why Are Rails Shaped Like That?

From “Practical Engineering”. ( YouTube / Nebula )

An overview of the wheel/rail interactions and part of the railway engineering series.
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Errata: At 6:52, the graphic should show the dimension of the wheel’s diameter (not radius).

In the 19th century, railway engineering was all about how to build railroads. Modern rail engineering focuses on getting the most out of the system. It might not look like much when you see a train passing by, but a huge amount of research, testing, and engineering went into the shape of those rails and wheels.

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Stock video and imagery provided by Getty Images, Shutterstock, Pond5, and Videoblocks.
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Source: https://www.youtube.com/watch?v=U6fBPdu8w9U
Video by Grady Hillhouse
Edited by Wesley Crump
Written and Produced by Ralph Crewe
Production Assistance from Josh Lorenz
Graphics by Nebula Studios