Also included in this set are some photos of downtown Pittsburgh and of the often photographed MP 321 signal in Greensburg, PA.
The Pittsburgh Terminal corridor stretching from CP-WING through the Fort Wayne Bridge was rebuilt by Conrail around 1980 to eliminate redundant and slow speed trackage as well as manned interlocking towers. The 4 track right of way was turned into a compact 2 track bi-directional line with space left over that was eventually used to built the East Pittsburgh Busway in the 1990's. As a result we see things like this pedestrian overpass at Lang Ave also supporting a pair of PRR Position Light signals.
In addition to a crossover, CP-HOME featured an interlocked connection to a small freight yard on the south side and the Brilliant Branch on the north.While the interlocking looks fairly straightforward today, in the PRR era there was a 4 track crossover, a flying junction from the west, another 4 track plant on the Brilliant Branch and a 5th pocket track running to a seperate "west end" interlocking plant.
CP-HOME also remained a pneumatic interlocking after it's Conrail rebuild because back then it made sense to save money on hardware.
The north end of the wye is interlocked. Trains from the east remain within interlocking limits, while the west leg is an un-signaled track re-connecting with the main via a hand operated switch. The "Begin Block" sign indicates the start of DCS territory.
The north end of the interlocking has it's own pneumatic air plant, pumping up an ancient riveted air reservoir all to power the single #9 switch which is possibly thrown just once or twice per day.
The north end air infrastructure features a near historical relic in the form of an "engine tap". These devices, marked on the interlocking sheets, were installed to allow locomotives to supply a pneumatic interlocking plant with compressed air via a standard air brake hose connection. This was an occasional occurrence back in the days of unreliable power and air compressors and the PRR wanted to be ready for it.
Back on the main line, a westbound manifest freight led by NS C44-9W #9328 with two SD60E's, #6738 and #6742 behind, coasted through the interlocking.
On the rear of the train was a sequential pair of SD40E helpers consisting of #6332 and #6331. As trains have made better use of dynamic braking, many helpers are no longer cut off at the top of the slope in Galitzin, instead riding the rear all the way to Pittsburgh. Previously there was a helper base at Pittsburgh station, but today the trains stop past one of the area interlockings, CP-TRAFF, CP-WING or CP-HOME and then have the helper disconnect and head back to Altoona.
Here we see the helpers having just uncoupled from a long string of empty tank cars for their lite run home.
The same helpers passing by and taking the Medium Clear signal at CP-HOME to cross over to the normally eastbound track #1.


















































