Army 41 postwar switcher

I recently acquired a postwar army 41 switcher.  This is a pretty significant departure for me as I typically stay away from anything with open frame motors except for the occasional original tinplate item. 

I lucked in one with a good body but known issues with the front coupler. 

I did a bit of research and decided to do an internal cleaning before anything else. 

For those who haven't taken one of these apart,  (like me), it's pretty straightforward. 

The end handrail stampings use no fasteners but are held in place by being captured under the cab body and on bosses on the ends of the frame. 

The typical problem with older pullmor is a dirty brush plate and lack of lube.  Both of these things were present here.

I finally figured out the coupler issue  that was dragging and causing a short, but I still want to replace the front coupler assembly.  Does anyone know how to get the coupler assembly of without destroying things?

Here's a test vid on rollers.

And one more, on the track and put to work.  I read these things were loud, but nothing prepared me for this.  Runs nicely though!

Now, if only it could made into a command engine with quieter operation.  Hmmmm.......