Originally CH switch tower in McKees Rocks, the structure served as CP-3 (Control Point #3 on the route from Pittsburgh Terminal to Gateway Yard) for the P&LE by the time this photo was taken in 1985.

 
 
Originally CH switch tower in McKees Rocks, the structure served as CP-3 (Control Point #3 on the route from Pittsburgh Terminal to Gateway Yard) for the P&LE by the time this photo was taken in 1985.
 
 

Jack Polaritz Photo