I collect photos and books about the area here and Cressona is basically in my backyard. Out of all the photos I have seen of the "Old Roundhouse" and "New Roundhouse" (which still stands) and yard photos... I have NEVER seen a water tower. Plus I have explored the remnants of the yard too. I know the RDG used water plugs in Cressona for sure. They had a water resevior speciffically set up on a hillside just above the current "Lite Yard" feed the water plugs. The RDG did have a coaling and sanding tower in the Cressona engine facilities.
READING COMPANY "AMERICA'S LARGEST ANTHRACITE CARRIER"