Switching a train with a diesel switch engine on the Chicago and Rock Island Railroad. Sourced from the Library of Congress. https://www.rawpixel.com/image/12292805/photo-image-person-sky-public-domainFree Image from public domain licenseBlue Island, Illinois. Switching a train with a diesel switch engine on the Chicago and Rock Island Railroad. Sourced from… https://www.rawpixel.com/image/12292780/photo-image-person-sky-public-domainFree Image from public domain license[Untitled photo, possibly related to: Rock crusher at quarry. Tygart Valley, West Virginia]. Sourced from the Library of… https://www.rawpixel.com/image/12248154/photo-image-plant-sky-treeFree Image from public domain license