Thanks to everyone for the input to an interesting conversation - hope to hear still from someone on the Williams truck question.
Here is how I'm describing it on eBay in an auction that will begin this evening and end on 5/06. I think this covers all of the points of discussion.
""Streamlined Pennsylvania tender, 1974 MPC shell with six wheel trucks"
Description ---------------------------------------------------------------------------
This is a very good looking Pennsylvania Railroad tender with gold leaf lettering. It has the type of shell that was sold as part of the Broadway Limited trains from MPC in 1974.
While photos of the Broadway Limited set show what looks like a four wheel freight truck, this tender has more realistic six wheel trucks. They are identical to the trucks on Lionel's 2761W and the Irvington style Pullmans. The trailing truck has a dummy coupler.
The shell is identical in detail to the 2671W except that the rectangle on the lower right of the rear end has molded into it "2671W-6", and it has gold leaf lettering rather than the white lettering on the Lionel tender.
This tender would look great behind a Lionel 671, 2020 or 681, or a model of the PRR T-1.
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