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The photo is of an Alco S-4.  Once upon a dcc sound decoder was made for the S-4.  Now, not sure.  Atlas managed to get sound inside an S-2, so its not impossible.  My suggestion:  Start with non-sound decoder installs first to build your confidence. Photos of the RS's will help in identifying them.  Also you will need a multivolt meter with a continuity setting.  This is to check that the motor is isolated from the track power.  If it is not the decoder goes poof.
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