When they were demonstrating the FT, they compared an A-B-B-A with existing steam locos, and if they hadn't bested the steamer it was said they would simply have added another unit. So, if we don't restrict the discussion to single O-Gauge units (what defines a unit anyway?) then would an A-B-B-B-B-B....A best all locos? If its sold as an A-A pair, does that count as one loco? or two
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