Forgotten Underpass Lights

This railway underpass still has the original mercury recessed square lighting mostly intact.They have long since been replaced with a pair of HPS wallpacks at each of of the underpass but have been left up because of how difficult it is to remove them.

Anyway the fixtures appear to be Holophane recessed squares from 1963. Not sure how they're ballasted although I didn't see any signs of a ballast inside the open one. This style of underpass lighting seems pretty rare, the older underpasses either used mercury wallpacks or HO/PG fluorescent. First time seeing recessed squares.