Pat showed my K-Line Hudson among many others on this thread Hudsons Galore...Tales From Harmon Shops I received it the middle of last week. Pat did a great job, including repainting to cover the light weathering the first owner had applied. You can check the link above to see what he had to say about it, so I will just say it looks, runs, sounds, smokes great. I tried running it pulling a nice set of Lionel Pulmans I received from forum member @chris a but had trouble with a switch that kept derailing the observation car. They ran great after I installed LED lighting, so I think the problem is the switch. I parked them on the back of the upper loop to show them off.
Here is a video of the Hudson pulling a train of 27 cars up and down my 4+% grades. Yes indeed, it is a stump puller as Pat says. I'm amazed that one motor can pull all of this. The upgrade is at about 1:20 into the video. Hat's off to Pat! He's the one that did it all. Disclaimer: I have the smoke turned off because I don't run smoke in the house.
I suspect pat gave it the nice fat Pittman, that will give it the power to twist gears off their axles. 
