https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/12290528Edit ImageSaveSaveEditCropCustom TextChicago, Illinois. These pneumatic tubes in the Illinois Central Railroad yardmaster's office connect him with the general office. 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 1134 x 1200 px | 300 dpiLarge JPEG 3308 x 3500 px | 300 dpiBest Quality JPEG 4777 x 5055 px | 300 dpiTIFF 4777 x 5055 px | 300 dpi | 46.08 MBFree DownloadChicago, Illinois. These pneumatic tubes in the Illinois Central Railroad yardmaster's office connect him with the general office. Sourced from the Library of Congress.More