Skip,
many thanks for putting up the loco-tender brake diagram, it's just what I needed! Now I understand how it all works, I just need to make a decision about exactly how to locate the two lines down through the deck and underneath.
I think I will put on a retainer valve line. Jim points out that there were examples of tenders without them possibly up to 1910 or so, but a review of photos convinces me that most all had them by my late-teens time frame. Now I can get back to work.
thanks again,
John
John Greenly
Lansing, NY