Male engineer pipeline industry outdoors. https://www.rawpixel.com/image/13148111/male-engineer-pipeline-industry-outdoors-generated-image-rawpixelView licenseRail tracks within 1,500 feet of underground passages at the Beckley Exhibition Coal Mine. Original image from Carol M.… https://www.rawpixel.com/image/434371/free-photo-image-mine-miner-west-virginiaFree Image from public domain license