PRR G25 "screw car"
Gatwood, Elden J SAD
Someone asked for a photo, and here is one:
https://digital.hagley.org/PRR_13469?solr_nav%5Bid%5D=b6e76c81d9c5e6f02def&solr_nav%5Bpage%5D=93&solr_nav%5Boffset%5D=19 Elden Gatwood
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