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Many early MTH items were prefixed with "MT", as in "MTH", I suppose. Soon the size and scale indicators of "20-" and "30-" became the standard indicators of the item's size and detail level (Lionel, why didn't you....?), though the RailKing Scale (demoted Premiers) 30- items messed all that up.

I took a chance and put it on a piece of test track, after opening both A units.  I did not see a battery in either unit, just a large capacitor soldered to a small Dallee board sitting over the speaker in the dummy A unit.  Fired it up and everything seems to work fine.

Question...would a single A unit work with only 1 motor?  I want to swap out one motorized truck out of the powered unit with an unpowered truck from the dummy unit.  What I want to know is, will 1 motor be enough to power 1 engine?  Not even sure I can do it, the metal chassis are not identical, won’t know until I remove everything.

 

Bob Delbridge posted:

Question...would a single A unit work with only 1 motor?  I want to swap out one motorized truck out of the powered unit with an unpowered truck from the dummy unit.  What I want to know is, will 1 motor be enough to power 1 engine?  Not even sure I can do it, the metal chassis are not identical, won’t know until I remove everything.

 

Since 1 motor will pull a train....

I have "distributed" power trucks before in a powered/dummy set, though not in your battery environment. It was a drop-in swap, as the AA set I was using was just that - a set, and the truck mounting was identical between powered and un-powered trucks. A powered truck is typically a dummy truck with power and some gears. 

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