Gordon Chappell did some research on this, here is some info from him. The tenders he refers to may be the ones still by the Skagway river. He may still follow this forum, and might be able to add more data.
MJ
"among the seven tenders below the Skagway cemetery in the summer of 1979 was one obviously off the former Denver & Rio Grande Western rotary snowplow. And over the decades, weather had carefully stripped off the later layers of paint to reveal an early 1890s paint and lettering scheme for the Denver & Rio Grande Railroad. I don't have the relevant files at hand, so this is off the top of my head, but as I recall the locomotive number on the rear of the tender was 243, but whatever number it was, it was a locomotive sold to the Rio Grande Southern Railroad about 1893, and at the time of the sale, the D&RG must have switched tenders, keeping the tender of that locomotive for use then or later with a snowplow."