MTH Premier
SD24 Diesel Engine w/Proto-Sound 3.0 - Southern
VO 1000 Diesel Engine w/Proto-Sound 3.0 - Great Northern
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3-Truck Shay Steam Engine w/Proto-Sound 3.0 (Hi-Rail ...
4-Truck Shay Steam Engine w/Proto-Sound 3.0 (Hi-Rail ...
4-6-6-4 Challenger Steam Engine w/Proto-Sound 3.0 (Hi-rail ...