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These lights were originally made by the Western Railroad Supply Company (WRRS) who later became Federal Signal Corporation (FS) then Western Cullen Hayes. They were used on new installations in Australia right into the 1990's so I'm guessing production stopped around that time.
I'm not sure which lights were made by which company, although I suspect the ones with the number 1585 cast into the top were made by WRRS. Other versions have the number M17768 stamped into the top of the housing, while others have no numbering at all.
The older lenses have WRRSCO written on one side and 1575-11P on the opposite side, with the newer looking lenses just having the number M150-11309.