There is a screw up from the bottom through the cylinders, remove the front truck to see it then the two screws under the cab and it should come off. Yes, I know it is tight, the 10 pin does not slide in where the 4 pin was, so I'll mod mine somehow. It's close though so I think with a little work it can be made to fit., I'm thinking about trying to make mine have a removable cab shell so I can detail the cab interior, but not sure I am good enough to make a clean job of it.
If you mean boiler front, I'm not sure if it is just friction, glued or lightly soldered, but it will pop out. Might be easier once you get the boiler off the frame and you can poke from the inside. Just be gentle, that brass is thin and you could do some real damage if your too heavy handed. Once the boiler sections come unsoldered, it is fun to put it all back together. I made a brass inner ring for mine and then used hose clamps around the outside and went at it with my propane torch. Was able to do that without softening the next course or the detail parts.
