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<a>http://cs.trains.com/trn/f/111/t/199255.aspx</a> 40/50 year rule.  49 CFR 215.203 Look at the build dates stenciled on your models.  Add 40 or 50 years as appropriate to the oldest one.   That is the latest that the car inquestion could have been in interchange service.  Also note that roofwalks would have been removed and potentially the brakewheel lowered. And despite what some people were saying the linked thread, it has nothing to do with solid/plain bearings.  Those were not banned from interchange until 1994.  All new cars after 1966 were required to have roller bearings.     You could also acquire an ORER from the year(s) you are interested in modeling.
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