Note the USA trains are smaller than the LGB F7's. I added one powered motor block to my B unit and weight over it and got a lot of extra pulling power and the B unit will run by itself. The 4 wire cable is for the speakers and the 2 wire cable is track power and the unpowered B units did not have track power, it comes from the A unit. My single motor block had added connections that mate with the LGB A unit via the 2 wire connector and I now have 3 motor blocks getting the same track power. Scale of these F7's by LGB were approx 1/26.
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