Stan; noted your comment about the PRR style signal head. I actually have the RK 2 track version of this signal on the layout, but it comes with all the timing etc built in of course. I just use two Z-Stuff actuators to sense train presence and trigger it. Looks nice though.
Guess you would have to use maybe the 339 comparator version, or the 3 x 555 version to run one that had just bare leds, and the center led could just be left on full time probably. I'm sure it could be done, but unless there are premade signal heads somewhere that don't have built in timing, there is likely no demand.
Rod
