One reason people buy DCC locomotives when they run DC layouts is manufacturers only issuing a certain loco in DCC or DCC+Sound options, but not in plain DC. Try finding a DC BLI steam loco. I got a pair of supposedly dual mode BLI PRR H10s 2-8-0s, one with the "West" tender and one with the "East" tender, as they are about the shortest 2-8-0 available, due to their short tenders, and they both run in fits and starts on DC, and often not at all. That is why I like it when Bachmann offer a loco in plain DC, DCC-Ready. I just yesterday ordered the ACL Pacific and SAL Mikado which both come DC, DCC-Ready. But even Bachmann have a bad habit of offering a model as DCC ready for some roads and DCC on-board for others, so it is pure chance whether you can get the engine you want in the format you want. I was lucky!
Bill.
Bill.