I just came into possession of a couple of older (DC only w/ smoker units) NORFOLK & WESTERN J Class 4-6-4 #608 and #611.  I have a sheet with a blowout of the parts, but they both need to be serviced – the #608 runs haltingly.    Usually youtube is a great place to find help on tearing down a machine, but I see nothing on these 4-6-4's.

Is there a sheet that shows how to pull the unit apart?  It looks like to me that to get to the gears and clean things (and lubricate) I may need to split the chassis (something I hear is not a fun exercise). I've removed the shell, but don't see any place where the bottom plastic chassis is affixed to the split.  The two small screws directly under the driver, which I removed, did nothing (nothing obvious to me).

I would appreciate anything you can share as I'm anxious to get these two cousins on the track and pulling some cars.