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Regardless of stretch in the chain, the rails have to be replaced between 90 and 100,000 miles. The rails are the biggest problem because of heat cycles and time. It makes no sense to leave the chain and gears in when replacing the rails. The gears and chain wear together and replacing one with out the other will wear the new parts excessively. You can not, have a gear or chain combination with different wear patterns. One new and one old will wear the other excessively.
Chain Stretch has nothing to do with Rail Degradation.
Ask any Machinist and he'll tell you the same thing.
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