I've seen some old articles where cheap paint brushes with the bristles up through the ties would rub against the axles of a car to stop it or slow it. That could be adapted to O scale/O gauge fairly easily. Would require some good carpentry to cut the slots into the sub-roadbed. Also, weighting the cars to NMRA recommendations (greater than the recommendation for smaller cars like PS2 2-bays and ore cars) would pretty much be a requirement
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