Atglen, Pennsylvania, a borough in Chester County, Pennsylvania, in the United States
Dalessandro, Robert J., & Knapp, Michael G., "Organization and Insignia of the American Expeditionary Forces, 1917–1923" (Atglen, Pennsylvania: Schiffer Publishing, 2008) The best single volume on AEF unit organization.
The line, through efforts from PA Congressman Jim Gerlach (R-PA 6) and the Delaware Valley Regional Planning Commission, may be extended back to Parkesburg and even further to Atglen in the future.