If I was to use DCC for banking (and the new layout requires all trains up the hill to be banked - sometimes involving up to four locos) I would need at least two drivers for every train. In practice all locos run together with the one controller once the train is formed up. See the Wentworth Junction thread for more on this but we were doing banking operations routinely on a Leeds club layout more than 40 years ago - we do have a lot of experience.
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