Actually Jay, I forgot others as well ... my oops! I was thinking strictly Conrail owned lines. New Jersey Transit owned, Conrail operated lines had different style color-lights. In addition, many signal bridges and cantilevers were still in use on NJT tracks.
If you're doing the former Erie Lackawanna lines, they each had their own unique color light signals as well.
The former Erie had a couple different styles, some being single bulb/multiple lenses and some being 3 bulbs stacked over each other vertically, a bulb for each color. And the Erie side also had two-headed signals with a really big gap between the top and bottom signal discs.
The former DL&W had an older style "bowling ball" type; with 3 bulbs, one for each color.
I can't recall what the former CNJ (NJT) main had, they were color lights, most likely the newer "bowling ball" stlye.
In general, Conrail's Automatic signals (the ones with a number plate, placed anywhere) were the 3-bulb "bowling ball" style and Absolutes/Home/Positive signals (the ones without a number plate located at Interlockings/power switches) were the single bulb/multiple lense type.
In summary, Conrail themselves used color lights (except for Upper Bay's PRR's) without signal bridges/cantilevers. If you're doing any Conrail trains on NJT trackage, better consult photos first ... Good luck with the project!!!