MTH HO Triplex 2-8-8-8-2 With Proto Sound 3.0 On TrainWorld TV .
Erie (Russian Iron) 2-8-8-8-2 Triplex Steam Engine w/Proto-Sound 3.0.
MTH HO 2-8-8-4 M3 Yellowstone Steam Engine With Proto-Sound 3.0 - Duluth, Missabe & Iron Range .
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brief video on my MTH protosound 3.0 M1 steam locomotive.