https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/12289930Edit ImageSaveSaveEditCropCustom TextChicago, Illinois. Car checker writing instructions in chalk for special handling of cars going over the hump at a Chicago and Northwestern 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 1173 x 1200 px | 300 dpiLarge JPEG 3423 x 3500 px | 300 dpiBest Quality JPEG 4733 x 4840 px | 300 dpiTIFF 4733 x 4840 px | 300 dpi | 43.72 MBFree DownloadChicago, Illinois. Car checker writing instructions in chalk for special handling of cars going over the hump at a Chicago and Northwestern Railroad yard. Sourced from the Library of Congress.More