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Lately I've been hearing these deeper K3LAs that sound a lot like RS3Ks.
Locos with this horn:
UP 7300 http://www.youtube.com/watch?v=6LB2WmkEpNc
UP 6910 http://www.youtube.com/watch?v=u0t4e0pP3mU
UP 6672 http://www.youtube.com/watch?v=6LB2WmkEpNc
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