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This is a set of TWELVE 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 for 1 hour 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 cluster or MV lens (700) for a non-lighted installation.