This N scale model by Dave Montgomery, won Best of Show in the Model Contest. Congratulations, Dave!
From some quick Internet research:
This model started out, I believe, as a Bachmann 2-6-6-2, and is a representation of SP class MM-3. Class MM-3 consisted of two little 2-6-6-2s, #3930 and #3931, that were WWII orphans from the Verde Tunnel & Smelter Railway in Jerome, Arizona. The pair of heavy compound articulated locomotives had rolled off the assembly line of Alco's’s Schenectady Works as construction numbers 61538 and 61539 in February of 1920, were placed in service in March of that year as VT&S R.R. 500 and 501, where they worked the steep grade between Jerome and Clarkdale Arizona. They were purchased by SP in 1943 during WWII to help ease power shortages, and spent almost their whole SP careers on the Los Angeles Division, helping on Beaumont Hill and in and around L.A. Number 3930 was the last of the compound SP Mallets to operate in active service as the "Colton drag engine" until 1954, when it was scrapped. Here is a link to a proto picture of #3930 with the 'rebuilt square tender' that dates this photo and the model, to the late 1940s. (Earlier, these locos had a smaller tender, and in the 1950's, #3930 had a SP Vanderbilt tender):and here's a Trainorders.com discussion of this loco: http://www.trainorders.com/discussion/read.php?10,2660866