If your wonting some cheap bearings the best would in my opinion would be Bones Red Bearings or Zero Black Widow Bearings. You can get both from ccs.com for around 16 bucks. If your willing to spend a pretty penny you could get 1 of the swiss bearing...
search internet for alied bearings or dixie bearings these are companies who sell all types of bearings .
Some good answers so far.... The freight car bearings are tapered roller bearings. Google timken, and go to their web site. The tapered roller bearings are used because they can take axial loads, which ball bearings cannot tolerate very well. They ar...