https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/12307152Edit ImageSaveSaveEditCropCustom TextFort Madison, Iowa. In the train control room at the Shopton shops of the Atchison, Topeka and Santa Fe Railroad. Testing the governor of a train control mechanism. 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 1176 x 1200 px | 300 dpiLarge JPEG 3431 x 3500 px | 300 dpiBest Quality JPEG 4893 x 4992 px | 300 dpiTIFF 4893 x 4992 px | 300 dpi | 46.6 MBFree DownloadFort Madison, Iowa. In the train control room at the Shopton shops of the Atchison, Topeka and Santa Fe Railroad. Testing the governor of a train control mechanism. Sourced from the Library of Congress.More