Violated rule #1, never post before coffee.
Well that explains all of the boners I have made over the years on this forum... its been about 5 years for me...
Any freight car truck can be scavenged for Timken bearing caps as well. Every model railroader has freight car trucks laying around.
Not every modeler. Besides, I would suspect that because of the weight of the switchers the RBs would be larger and most would have covers. At least some models that they can be stolen from are fairly cheep on the 'bay...