A sad day on the former Middle Division...
Signals have always been a big part of my layouts since I was a teenager. My current layout which portrays the Middle Division of the PRR is heavily signaled with position light signals, including these models of bi-directional signals installed by Conrail in the 1980's. Sadly, with the advent of Positive Train Control, these PRR style position signals are being taken out of service, and replaced by modern "Darth Vaders."
The first two photos show a pair of these signals (mounted on caissons as per the prototype) in service on my layout just west of Mattawana at MP 182:
The next photo shows a prototype signal at Horningford PA (also near Mattawana, but to the east) taken by son Steven last Saturday, March 2 on its final day of service, and yes, he drove all the way out there (3 hours!) to photograph it!
And finally, here is a picture of the same signal, the very next day, forever out of service...
Incidentally, here's a map showing the location of these signals. The model signals portray those located near the arrow at the bottom of the map, and the prototype images were taken near the arrow near the upper right corner. This area is located in central Pennsylvania.
So indeed, it is a sad day for those us who love the Middle Division, the PRR, signals, and everything Pennsy!