https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/12294399Edit ImageSaveSaveEditCropCustom TextRoute of the Iranian state railway train (right) heads into a tunnel. Notice the several tunnel entrances shown in this photo. 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 1200 x 722 px | 300 dpiLarge JPEG 3500 x 2105 px | 300 dpiBest Quality JPEG 8091 x 4866 px | 300 dpiTIFF 8091 x 4866 px | 300 dpi | 75.11 MBFree DownloadRoute of the Iranian state railway train (right) heads into a tunnel. Notice the several tunnel entrances shown in this photo. Sourced from the Library of Congress.More