The K-37's were originally built as standard gauge 2-8-0's by Baldwin in 1902 Ten of these engines were converted to narrow gauge between 1928 to 1930 by the D&RGW. New chassis were created, and the boilers and tenders were used over again on the narrow gauge versions. D&RGW numbered these engines 490 to 499, and most survive today on display. These engines were not as popular as the K-36's. The reason for this was the K-36 was easier on the crews and the track as well. However in model form the K-37 is the largest locomotive that can be built in 1:20.3 scale The huge boiler allows runs of well over an hour without ever injecting water. This new Live Steam version is also cross ported so that valve gear is in prototypical position for forward and reverse. This large model is extremely powerful , but unlike the prototype is very easy and rewarding to run.