Posted by Sid Vaught on February 10, 2022  I don't think I ever saw a tri-light signal in CA. Did SP switch to those in later years or just cadge some for their old Rock trackage? Posted by Mark MacDougall on February 10, 2022  Sid, I believe Metrolink installed this signal, however, there’s some tri-lights SP installed in AZ & NM before the merger.

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