Ah. Memory clearing, fog lifted. . TMCC/DCS does make more sense than TMCC/RS.
Note that little plastic "cover" that was used to force an operator to switch it to Conv with specific intent, not just accidentally. That was a good idea by K-Line, IMO.
If it's on TMCC/DCS and you are running conventional, you will just get low or no smoke (not tragic). If it's on Conventional and you run TMCC/DCS at full 18V on track, you can get melted caboose (obviously more of a negative impact to the unit).
-Dave