Original message (April 2018):
I have been collecting photos, models and learning these two mysterious engines for about two years (another one is S2 #6200 turbine). I searched every corner on the web, but information about PRR Duplex S1 #6100 and Q1 #6130 are extremely rare. Take PRR S1 for example, I can’t even find its total mileage of her entire career.
I know there are some good readings in a few issues of “Keystone” magazine about T1s 4-4-4-4, but content about S1, Q1 are very rare and brief. There is not even one article about S1 in the most reliable source like the “Keystone”. Some books and web pages about S1 and Q1 are base on rumors and historically inaccurate. If you have any books, articles or files would like to recommend, please kindly let me know! Much appreciated! [tup]
Updates (Dec 2018):
Thank you all who participated in this thread in the past few months, helping me to understand the history of PRR Duplexes and experimental engines in-depth. Please feel free to join the discussion, sharing your thoughts about these fascinating projects