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Reply to "Couplers open when used in a large # of cars train"

If by Dental rubber bands you mean the rubber bands used with braces, these are also separated by strength.  The ones my daughter uses have the strength identified by animals, the larger the animal, the stronger the rubber band.  I'm not the expert on these but these bands are designed for single use, makes me wonder how long they would last in non mouth environments.  IMHO, the most challenging part of this idea would be putting the rubber bands on the couplers.  A couple of dental picks would come in handy.

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