It's a matter of maybe 6 screws to remove, then lift the chassis away from the shell. Similar to the postwar GG1. You just have to examine the screws when you turn the engine upside down in a cradle. The chassis-to-shell Phillips head screws are larger/have bigger heads than other screws holding slide switches and other parts. The wiring for the lights and the pantographs is easy to unplug. I'd say the manufacturers are pretty good at designing ease of shell removal. Much easier than taking apart a scale brass engine with all those optical screws. Nice to have a screwdriver that's somewhat magnetic, too.
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