"more non-real by a plastic locomotive"
Aren't the 3rd Rail PA's plastic, if I catch the drift of your comment?
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"What I was really looking for were opinions on quality and features. It seems it's become commonplace, at least with Lionel, to buy a new engine and then immediately need an RA number to return it for repairs."
OK, if that's what you want. First, what percentage of Lionel's pieces are actually faulty and get returned for repair? Do you have this figure at hand? (I have no importer's dog in this fight, BTW.) Secondly, I have several 3rd Rail locos - all steam except for the NYC T-3 electric - and they have been hit-and-miss on their construction and operation quality. Some have been fine, others (I've mentioned this before here) have had pieces fall off when removed from the box. These were new from 3rd Rail. My SP MT-4 4-8-2 has a flywheel that likes to come loose on the shaft - I have to tighten it every so often.
I will buy 3rd rail under certain circumstances - and I even have a NYC R-2 on order (if ever...) right now because no one else will make some of this stuff - but I always have trepidation when I do.
Many brag on 3rd rail, and I am sure that their stories are accurate, but so is mine. Given a choice between a 3rd rail product and one produced by Lionel or MTH of the same/similar prototype, I would choose L or M, especially pre-Legacy TMCC and MTH PS-1 (easily upgraded to ERR electronics).
You asked.