Power draw can be all over the map. The max is usually if for whatever reason, you have a motor stall. In that case, the max current can go to a few amps. For instance, the Pittman 9234S004 that is used in quite a few older O-gauge steam models, has a peak stall current of 14.49 amps at 12V! Even the small Mabuchi 3xx series has stall currents in the 3-4 amp range, if you have two of them stalled, double that.
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