GP-7 Horns

Discussion in 'GP7' started by myopiceagle, Oct 31, 2010.

  1. myopiceagle

    myopiceagle Member

    Would someone be kind enough to confirm or correct me on this please?

    Looking at early photos of Friscos GP-7's, they appear to have Leslie Tyfon A200 (?) air horns when delivered. Then they were replaced with the Leslie Super-Tyfon's after 1953. Correct?
  2. meteor910

    meteor910 2009 Engineer of the Year Staff Member Supporter

    I think you are essentialy correct, though I'm not sure what the as-delivered GP7 horn model was. One was mounted on the side of the short hood facing forward on the engineer's side - another facing to the rear on the other side, but back a bit on the side of the long hood, just aft of the first radiator grill.

    The Frisco didn't think they made enough noise, so in 1952 they conducted a series of tests on replacement horn models and different locations.

    The Leslie S-5T-R was the winner, and the Frisco used them for years in various configurations, mounted on the cab roof right of center. Other horn models were used here and there as well - I have seen several GP7 pics that clearly have a Nathan M5 mounted up on the cab roof.

    The Leslie was the favorite, though. I think somebody in the SLSF motive power department must have had an ear for music as they chose the most melodious horn.

    Last edited by a moderator: Oct 31, 2010
  3. wmrx

    wmrx MP Trainmaster

    The as delivered single chime horn was more than likely the Leslie A-200 as originally suggested. The only other option would be the Wabco E-2 which is very similar. The Leslie horn was by far the most common on an EMD.

    The Leslie S-5T probably won out because it required much less maintenance that the Nathan M5. Another factor could have been the lower notes that came from the Leslie. They tend to carry a longer distance than the slightly higher notes of the Nathan.

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