looking at the selection of various tenders I’ve acquired, it occurs to me that the air whistle tender from the “train set” Polar Express Berkshire could be combined with the tender from the MPC Hudson, to produce an air whistle tender with 6-wheel bogies and die-cast body, to accompany the Hudson.
The key question is, are the base plates interchangeable? They look as though they have the same mountings, does anyone know for sure?