MTH 30-21008-1 O FM H10-44 Diesel Engine w/Proto-Sound 3.0 - Union Pacific
MTH 20-21847-1 U25B Diesel Engine With Proto-Sound 3.0 (Hi-Rail Wheels) - Chesapeake & Ohio Cab No. 8114
MTH Premier 20-3702-1 Kansas City Southern 0-8-0 USRA Steam Engine ProtoSound 3.0
PWRS Pacific Western Rail Systems
MTH Premier Bessemer B&LE SD40T-3 Diesel w/ proto-sound 3.0, lash up coal drag
Diesel Engines - 3 Rail - Atlas full O scale size - Page 1 - The Public Delivery Track
MTH 30-21165-1 O RS-3 Diesel Engine With Proto-Sound 3.0 - Louisville & Nashville Engine No. 105
Mth Pennsylvania Railroad Dd 1 Locomotive, O Gauge
MTH 30-21112-1 O Dash-8 Diesel Engine w/Proto-Sound 3.0 - CSX (MEC - Trainworld) Cab # MEC 7898 Smurf Nose