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This is a set of SIX N scale nose headlight clusters commonly used by Southern Pacific and seen on many modern locomotives with ex-SP lineage. Used for near end of SP era, when gyralights were removed and beacons added to cab roofs.
To install nose cluster, soak in Bestine overnight to fully remove all wax support material. Cut hole into nose of locomotive adjust for a snug fit. Install either 1 mm (.040") fiber optic for a lighted gyralite or MV lens (701) for a non-lighted installation.