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New York City Electro-Mechanical Signal Controller
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Here, is a G.T.E. (General Traffic Equipment) model B-3/Marbelite M-30 electro-mechanical signal controller in Manhattan, New York.
Aside from Marbelite E/M signal controller equipment, G.T.E. E/M signal controller equipment was once used in New York City as well. G.T.E. and Marbelite parts are interchangeable, therefore, they are compatible with each other.
General Traffic Equipment first began to manufacture electro-mechanical signal controllers in 1984, and they continue manufacture parts. The only company known to still manufacture them.
They first began to appear on the streets of N.Y.C. in probably the late 1980s or early 1990s. They were used at new installations prior to when the city officially converted from E/M signal controllers to computerized signal controllers in 2005 or so.
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Many E/M signal controllers in New York City are controlled by these rather sophisticated computer systems.
They share other special features as well, such as interconnection (which is also used), preemption, and vehicle and pedestrian detection.
Although since I own two N.Y.C. E/M signal controllers in my private collection, I have the right key to open any lock on any E/M signal controller cabinet that is still in existence in New York City.