Adding to the MTH list: Smoke units. The ones I've seen are in late PS1 engines.
Adding to the Williams list: FA side frames.
Adding to the K-Line list: Heavy Weight trucks and coupler assemblies. Also Heavy Hauler tractor trailer vans.
Well known: Atlas O woodside reefers.
All the above are zinc pest casting failures.
Chris
LVHR
Edit: Per a suggestion below, pictures added.