Along the main lines wig-wag signals were common, maybe even in Tucson, Ariz in '65 but there were lots of underpasses, not operating is okay if the sound is right/works. Have drawing of real thing, but the mass and rate has been a puzzle to me, has to swing right, light flash, have thought of a weight below, mass, wire, or some scheme, Ideas, thoughts, lighted cross buck types are a 2nd choice, sound still important. - Puma
Sounds like it will work to me.
Elmer.
The above is my opinion, from an active and experienced Model Railroader in N scale and HO since 1961.
(Modeling Freelance, Eastern US, HO scale, in 1962, with NCE DCC for locomotive control and a stand alone LocoNet for block detection and signals.) http://waynes-trains.com/ at home, and N scale at the Club.
There are a few operable PE examples left in my area, but it's been years since i've seen one in operation, as I recall they had a slow, steady deep bell tone to them, movement was steady. I'm in the same situation with my S scale Citrus Belt, no one makes these and i'm in need of several, lucky, I have one in my collection, courtesy of an abandoned PE line to use for motivation!!
Dave