I am highly biased and think it is any of the sets with the coal-fired Vanderbilt tender,
from which I will steal and kitbash the 0-8-0 engine, and tender, maybe keeping only the tender and selling off the rest I am not sure any of these are in current production. (the internet seems to indicate that others are doing the same as the
engines, without tenders, are offered on there) Wonder when they are going to
smarten up, like K-Line, and offer tenders for separate sale?
These are the only current Lionel engines I have.