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The first release of Blackstone Models HOn3 D&RGW 30-Foot Refrigerator Cars features a SoundCar-ready design for the easy addition of rolling stock sounds to the model. The design includes a built-in housing for a 35mm x 16mm speaker, and openings in the underbody for the sound and wires. In this video, Ken Patterson shows how to install the SoundCar decoder into the model, as well as how to modify centering springs to use as track pickup wipers. He also installed an optional CurrentKeeper in the model to ensure continuous operation of the decoder during brief power interruptions.