In looking for something else, I just happened to find some Weaver catalogues. First one I picked up was the 2009 catalogue, which listed a Maine Central PS-1 40' boxcar. You may also want to reach out to the former owner, Joe Hayter, who may recall or be able to determine whether Weaver made any other PS-1s in the New England road names. You can find Joe on LinkedIn and he occasionally attends the York Meets.
Pat