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proto sound 3

  1. O Scale
    Finally, Protosound 3.0 for MTH O scale locomotives is nearing release... MTH has used the PS 3.0 system in their HO scale line since its inception... Here is one of the first locomotives to be getting the system: http://www.mthtrains.com/news/451 I hear that it replaces the PS 1 and 2.0...
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