|More info here.|
Found on Amtrak's electrified system from New Rochelle to Washington, DC and all the way out to Harrisburg, the CzPL is either a long overdue update of the former PRR system or a short sighted overreaction to a problem that never existed. Position Light colorization began as a response to the Chase, MD wreck based on a finding that the all-amber position lights were not salient enough. Considering the crew of the Conrail train that missed the signal were all high on pot, I'm not sure color would have done much to rectify the situation. In fact many charged the colorization made the signals far less visible, especially in the poor light conditions the amber PLs were designed to excel in.
|Can you see me now?|
|LED CzPLs certainly pass the snow test.|
The last amber PLs were installed by Amtrak in the mid-1980's on the Hellgate line, at the new PHIL interlocking and at FRAZER interlocking on the Harrisburg Line ~1994. Apart from those locations amber PLs only survived on the Harrisburg Line and un-resignaled portions of the corridor.
|Two masts separated by 50 feet and 50 years|
In terms of interesting features the only two anomalies are the use of a central lunar white lamp on the lower head for Stop and Proceed indications, which under NORAC are still distinct from Restricting indications. This allows the lower head to avoid the gaping blank spot the upper head has to contend with. Also the flashing green | for Cab Speed was not replicated on amber PLs since I guess the NORAC committee no new interlockings would ever revert back to the amber system, especially not ones with high speed turnouts.
|New signals, new RGY colors.|