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Amtrak colorized the Northeast Corridor signals it inherited from PRR,
but this line became Penn Central's, then Conrail's, and finally CSX's.
All of those rail companies left these signals in monochrome PRR form,
and as of 2022 they are two of this region's few such survivors.
Also unusual is the configuration: three tracks, but just one signal
facing each way. Furthermore, despite this being CSX trackage, the number
1313 represents 131.3 miles distance from PRR's ZOO Junction in
Philadelphia.
CSX installed the adjacent newer gantry around 2005-2006 to hold height
sensors. To that gantry around 2021 it added new signals, not yet
energized at photo time.
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