Received the following via email. The photographer was not identified. First picture was taken on 11/2/11 and last 2 pictures on 11/18/11.
Construction and in-service photographs of just-completed Closed Spandrel Concrete Elliptical Arch Bridge project on the historic Strasburg Railroad (now in its 180th year). The line has been operated as a steam-powered tourist attraction near Lancaster, PA for over a half-century. The blue-sky day photo of Great Western #90, a steam locomotive built in 1924 crossing the newly-opened span, with its 2011 build date cast into the concrete of the arch's crown, is a bit of a chronological mind-bender!