What sort of freight car used these wheels to lock the doors?  I'm working on a concept...

Thanks!

Mitch 

Original Post

Mth and overland brass are the only ones I can think of in o scale / o gauge.  Plans for the MHC were in an issue of Model Railroader when they first appeared.

That is a plug door.  It rolls on a track, but when it gets to the doorway cam action forces it inward into the opening.  The door has rubber seals all the way around it. To get a good air and water tight seal around the door a good deal of force can be  required to cam the door in tight. The big wheel replaces the three foot piece of pipe most people dealing with these doors used. 

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