i like the larger size of the 2-8-0,4-60,compared to the mallet,which is dwarfed by the pass cars. i run a fictitiuos class one railroad in on30,as a subsiduary of the P.R.R,so these units are quite at home,love the motion in slow motion,smooth as. have two mallets that have different drawbar pull,i.e. 1 pulls more cars than the other.any ideas on why?