A lot of standard gauge Mason bogies had Walschaerts valve gear as well, so it wasn't just a narrow gauge phenomenon. For example, here is Long Island RR No. 59 (Mason C/N 702, built in 1883), photographed at the Bay Ridge, Brooklyn enginehouse circa 1890. (This was on the former NY&MB narrow gauge, which the LIRR acquired and began converting to standard gauge in 1881.) Note how, in classic Mason fashion, the lifting arm is attached to the bell cradle.
(The photo is posted on Art Huneke's website, but I actually purchased the original 1890 print from him a year or so ago, along with a second photo showing the same engineer posing with a different locomotive. Art told me he found the two photos together in an antique shop in the early 1960s, and now more than 50 years later I'm honored to be their new custodian.)
-Philip Marshall
Edited 2 time(s). Last edit at 04/18/2017 05:19PM by philip.marshall.