The only restriction would be curve radius and track switches. You'll
need O-72 curves and track switches to match. You will likely need a
more powerful transformer, too. It's a very big engine.
BTW "20 wheels" is not very informative. Describe the locomotive by
listing the small wheel at the front (pilot truck wheels) if any, then
the large wheels (driving wheels), then the small wheels at the back
(trailing truck wheels). I searched, and found the engine with "20
wheels", it's the Pennsylvania RR steam turbine locomotive. Very large.
BTW, if you can do this, disassemble the engine, and clean its innards.
Then _lightly_ lubricate all bearing surfaces. If you can't do this,
it's money well spent to get it done.
It's a 6-8-6, and AFAIK only the Pennsy had this wheel arrangement.
Google "PRR 6-8-6 steam turbine class S2" for more.
I would go for at least a 74 watt unit. Your unit will run the engine,
but IMO doesn't have enough oomph to trigger the reversing relay inside
Here is a link to information on your 671. You can try your
transformer. If it won't pull it or gets to hot you will have to move
up in wattages. If it is a lionel transformer most have overload
protection. Have fun Tom
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