Curtis, Oklahoma. Helper engine leaving the train on Atchison, Topeka, and Santa Fe Railroad. Sourced from the Library of… https://www.rawpixel.com/image/12290399/photo-image-cloud-sky-smokeFree Image from public domain license[Untitled photo, possibly related to: Guanica, Puerto Rico (vicinity). Burning a sugar cane field. This is a process that… https://www.rawpixel.com/image/12280863/photo-image-cloud-sky-leavesFree Image from public domain license[Untitled photo, possibly related to: View of East Mauch Chunk from Upper Mauch Chunk with Lehigh River in foreground. Mauch… https://www.rawpixel.com/image/12276718/photo-image-plant-person-skyFree Image from public domain licenseRelax Coffee Break Time Graphic Concept https://www.rawpixel.com/image/293049/image-rawpixelcomView licenseRelax Coffee Break Time Graphic Concept https://www.rawpixel.com/image/293037/image-rawpixelcomView licenseThe Pittsburgh Crucible Steel Company of Midland, Pennsylvania. Sourced from the Library of Congress. https://www.rawpixel.com/image/12277796/photo-image-plant-person-skyFree Image from public domain licenseRelax Coffee Break Time Graphic Concept https://www.rawpixel.com/image/661031/free-image-rawpixelView licenseAsh Fork (vicinity), Arizona. Passing an eastbound freight train on the Atchison, Topeka and Santa Fe Railroad between… https://www.rawpixel.com/image/12292843/photo-image-sky-smoke-roadFree Image from public domain licensePollution Dirty Chemical Problem Smog Smoke Concept https://www.rawpixel.com/image/279179/image-rawpixelcomView license[Untitled photo, possibly related to: Kingman (vicinity), Arizona. A train on the Atchison, Topeka and Santa Fe Railroad… https://www.rawpixel.com/image/12292663/photo-image-sky-smoke-public-domainFree Image from public domain license