The morning run leaves Hill City and heads for Keystone with a train load of tourists. 110 is a 2-6-6-2 Mallet under a full head of hissing steam. It is about to begin the climb up the 4% - 6% ridge making lots of noise and smoke as it goes. It's quite the sight. The 110 is a Baldwin 2-6-6-2T Mallet, built 1928, and the last operating model of its type.