This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Perspective view of east portal looking WSW. Allegheny tunnel at left Gallitzin tunnel HAER no. PA at right . en Trimmed black borders and formatted as file from File Perspective view of east portal looking WSW Allegheny tunnel at left Gallitzin tunnel HAER no PA at right Pennsylvania Railroad Allegheny Tunnel Beneath Allegheny