https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/12290532Edit ImageSaveSaveEditCropCustom TextChicago, Illinois. Retarder operator's tower at the north hump at an Illinois Central Railroad yard. Sourced from the Library of Congress.View public domain image source hereMorePublic DomainFree CCO U.S. Government image for Personal and Business useInfoView CC0 LicenseEditorial use only JPEGTIFFSmall JPEG 1136 x 1200 px | 300 dpiLarge JPEG 3314 x 3500 px | 300 dpiBest Quality JPEG 4817 x 5087 px | 300 dpiTIFF 4817 x 5087 px | 300 dpi | 46.76 MBFree DownloadChicago, Illinois. Retarder operator's tower at the north hump at an Illinois Central Railroad yard. Sourced from the Library of Congress.More