As for the original topic, if the hubcap was not lying on one of the rails themselves, probably nothing as it wouldn't be high enough to catch any part of the undercarriage.
If it were directly on a rail, likely minimal (and repairable) damage at most. I doubt it would cause a derailment and/or disaster.
Besides, who knows how long the hubcap was there before you saw it and picked it up? Chances are, several trains had gone over it at that point.
Last edited by frinkprof; 02-12-2010 at 07:58 AM.
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