Markers for RDG, D&H and PRR Cabin Cars

I would like to add working markers to my diverse HO caboose/cabin car fleet. I model the late 1960s to the mid 1970s.

First off, any tips for adding markers in general?

Second, any ideas about the Star Markers? They look the flashing lights on top of highway constuction barriers.

I image I could simulate most of these markers with LEDs.

Delaware & Hudson - Atlas Wide Vision and Athearn Bay Window

When did D&H transition from add on Star Markers like this one:
http://www.rr-fallenflags.org/dh/dh35715akg.jpg

To built in markers like this one:
http://www.rr-fallenflags.org/dh/dh35792akg.jpg

Pennsy - Bowser N5c

I found several pictures of cabin cars with the add on Star Markers:
http://www.rr-fallenflags.org/prr/prr477727alr.jpg

Did Pennsy ever transition to built in markers?

Reading - Atlas Wide Vision and P2K Northeastern

RDG used built-in markers:
http://www.rr-fallenflags.org/rdg/rdg94113akg.jpg

They look much smaller the classic maker lamps. Any ideas?

Nick

I believe Tomar produces working markers (Adlake).

Edit: OOPS! Wrong markers. Sorry.[:I]