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Roughly speaking, N gauge is half the size of OO gauge, so in theory you can have four times as much stuff in N gauge.
Traditionally, a controller (DC) sends X amount of electricity to the track and every train that is on that track will move. DCC works a bit differently, each loco is fitted with a chip, the controller sends an encoded signal to the track, the loco with the right programming will respond to that signal and act accordingly, all others will stay as they were.
Basically:
DC: One controller per track.
DCC: One controller.
As a side issue, DC trains can be used on most DCC layouts, however, they have a tendancy to cook themselves. Most DCC locomotives will run fine on DC layouts.
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