On 3/5/2018 2:00 PM, John Hagen via
Mantua cabs, diecast or plastic, were separate pieces.
diecast cabs were held in place by a screw through a
smallish projection (tab) at the front top of the cab
casting. The tab would be the first thing to break off if
the was any sign of “zinc rot.”
On mine, the tab was/is on the top rear of the boiler casting. A
screw would go up through the cast metal tab into the underside of
the plastic cab to hold it in place.
bother to ask how I know this. However I’ll tell you my
first HO locomotive was a 2-8-2 I received for Christmas
1949. One day my perfect appearing boiler, cab and tab were
all separate pieces.
So, that happened to you, too! I just took a little longer with my
parts. At least, the side and connecting rods were not zamac
castings. I wonder for how long the chassis castings will hold up.