Welcome to the forum. Hope you enjoy our camraderie.
Now, as for a vertical boiler, I have a Marklin #8 vertical boiler,
dual voltage, that is just under 3 1/2 inches. It does heat up and
has all parts but the engine itself (unobtainable, it seems). If you,
or anyone else is interested, it could be up for sale or barter. I'm
in no rush. You can reply in this thread or PM me.
Wayne