Thanks for the info on #74/10. Here is an annual inspection report for SVRy 10 from our archives. The second photo is cropped from the photo of #10 that I posted earlier in the thread. This appears to be a plain triple valve on the tender mounted to the end of a large piece of pipe maybe 4-5" in diameter and perhaps 5 or 6 ft. long instead of to the end of a more common style of auxiliary reservoir tank. Was this a common feature for these and other engines of this era or a one off sort of thing?