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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.
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 gyralite or MV lens (701) for a non-lighted installation.