https://creativecommons.org/publicdomain/zero/1.0/ https://www.rawpixel.com/image/429724 Zig-zag Passenger and Freight Train by an unknown artist. Original from Library of Congress. Digitally enhanced by rawpixel.

Zig-zag Passenger and Freight Train by an unknown artist. Original from Library of Congress. Digitally enhanced by rawpixel.

Free Public Domain CC0 Image

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