The truss rod mast arm was first used in the mid 1950s, and became the most common way to suspend signals in New Jersey, whether vertical or horizontal. Today, they are still widely used in new installations, along with (ugly) tube masts.
Totowa Rd. & Glover Ave., Totowa,
photos by Steven Conboy, 2017
A lovely example of truss rod masts is this beautifully preserved, very early example of LFE-Automatic incandescent signals. I’d guess these are from the late ’60s or early ’70s. I dig the green fading to yellow, something I have also seen on a few Marbelites. The 12″ arrow units on these lights are actually by Marbelite. Great photos, Steven!