I’m not certain where I got this, but I’m pretty sure it was written by TOC.
Annie dis-assembly
The Top Side
Pry the pilot support rods from the sides of the smoke box
Remove two long screws under the cab
Remove two short screws from the sides of the boiler near the lower center of the boiler
Remove the extra long screw under the cylinder saddle
Remove four long screws from under the air tanks. The tanks will fall off.
Carefully lift the shell off. Be careful about the wires to the smoke unit and headlight.
Do your stuff
While you’re in there, glue 1 or 2 lbs of lead on top of the cast iron weight. Note that extra weight will add capability to pull more cars, which means that you can make the motor work harder, which means that the motor will run hotter. If you haven’t reinforced the motor mounts, adding weight WILL result in rapid failure of the engine.
Reassemble in opposite order.
I’ve had mine open several times. It’s a bit of work putting it back together, but nothing you can’t handle.