The 50 tonner? Well … depends. Southern Pacific #1 arrived in 1953 and ran to 1961, thereafter went to Mexico, converted to SG (the trucks were SG all along, the wheels just had to be moved out on the axles) and it ran for … well, awhile, and still exists, though no longer serviceable. There were some near-twins built for Chiriqui Land in Panama that ran until … well, just recently, and two of them are now on the Sumpter Valley in Oregon, and at least one is being returned to service (there’s a Youtube video of the first crankup …) The two at the CRM, formerly Georgetown Loop, and before that US Gypsum are very similar, built 1958, and have been in service more or less ever since.
Bob … I like those on that roof! If you don’t want the spacer (or have a clearance issue…this loco is large enough as is…,) they should sit flat with the flat spot on the longest bell (which is prototypical…) I’m about to go downstairs and test fit mine on the 50 tonner …
Matthew (OV)
Ya know, though … I might be tempted to move those to the middle of the roof just to spare the engineman’s ears… 