Bob, what differences are you seeing between the Challenger and the Y3a? I own both, and the chief differences I've noticed are: 1) the Y3a can run on AC, DC, or Legacy while the Challenger is only AC or Legacy; (on straight DC the tender reverse light is illuminated going forward and off when going in reverse); 2) the Challenger had some problems backing through American Models switches until I switched around two wheelsets on the tender; no problems at all with the Y3a; and 3) the Challenger was missing some simple details, such as an ash wheel on the engineer's side. I know there are some design improvements in the Y3a drive coupling that Carl Tuveson pointed out in his review, but those may not be noticeable until the Challenger begins to wear sooner. Are there some other differences I may have missed?
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