I grabbed an ABA set from MTH. Proto Sound 2.0 Alaska. They're beautiful! I'm not clear on a few things. The manual and specs say both A units have drive motors. However, only one will power up independently and run. When all three are linked up the second A unit does light up and run. Is the intended design? One "master" A unit and they all have to run together? Or, should I be able to run each A unit independently?
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