The TSU-2200 is a universal 2-amp Digital Sound Decoder. It is suitable for a wide variety of models from HO to S scale, and includes a connector to easily add a Current Keeper (P.N. 810140) to maintain performance over dirty track and switches.
This is the revised Steam Decoder with the Steam2 sound set. The full list of sound can be seen on the Steam-2_Sound_Selections PDF