The title block says: "P.R.R. Co., Western Lines, Type "A" Engine House, Crane Section - Steel Design, Typical Elevations, Temporary and Pemanent Ends, Office of Chief Engr-Constr, No. 18477". The drawing is dated Aug. 2, 1918, and revised July 25, 1918.
This drawing shows the end elevation plans for the Type A engine house. On the top of the drawing is the end elevation for the pemanent end, and the bottom drawing is for the temporary end. The temporary end was used as an easy way for the PRR to add on to the building should that be necessary in the future.