Discussion relating to the PRR, up to 1968. Visit the PRR Technical & Historical Society for more information.
  by timz
 
On Shorpy a guy said

"The ironwork in the concourse [of NY Penn] did not actually support the glass ceiling as it appears to do. Rather an unseen exterior truss cantilevered from the outer walls, and the glass ceiling essentially hung from it."

A north-south truss 400+ feet long? Two of them? Never seen it in pics looking down on the station-- was it visible? But not visible in interior pics?