https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/12337277Edit ImageSaveSaveEditCropCustom TextChicago, Illinois. Telegraph switch board of the Pennsylvania railroad in the Pennsylvania telegraph room at the Union Station. 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 1118 x 1200 px | 300 dpiLarge JPEG 3261 x 3500 px | 300 dpiBest Quality JPEG 4908 x 5268 px | 300 dpiTIFF 4908 x 5268 px | 300 dpi | 49.32 MBFree DownloadChicago, Illinois. Telegraph switch board of the Pennsylvania railroad in the Pennsylvania telegraph room at the Union Station. Sourced from the Library of Congress.More