As I just replied to another post about this issue, Joe is correct. The switch was removed so that the engine would run only in DCS mode. To run with DCC, you needed to open the shell and cut the grey wire. At least this is the procedure with an SW-8 switcher made in 2017 that I just received. Needless to say I won't be cutting the wire. If you wanted to, you could install a switch and attach that wire to it and switch from DCS to DCC and back again.
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