I read that some types of track require stressing every so often otherwise it loses its properties (in context of Polish railway laying new track then not running heavy trains on it and in consequence track had to be replaced again).

A slightly related issue is that airline pilots need to fly certain amount of time/operations to remain in current training.

Part of the big problem with reactivating MiG-29 squadrons in Poland after the "aftermarket mods" resulted in grounding was that even the instructors lost the legal right to examine training level.