MTH Protosound Boards:
Locosound board:
Locosound: (Used in Older O gauge engines)
Protosound 1 (Top board): (Used in Old O gauge engines)
Protosound 1 (Bottom board): (Used in Old O gauge engines)
Example 1: 5v Board (Used in O gauge) (2000-2003)
Example 2: 3v Board (Used in O gauge / One gauge / G scale engines) (2004 to current)
Example 1: PS3 board (O Gauge - Steam tender)
Example 2: PS3 board (HO Scale) (Used in HO scale engines only)
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