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What I was talking about is a locking dog that would act like a deadbolt to lock the air brake in the applied position.   The locking dog would be held in release by air, and moved to lock position by spring when the air is removed.  For switching where a cut is broken up, the air in the cars would be bled so the brake pistons retract and release.  Then when you let the air out of the locking dogs, they cannot lock the brakes when the brakes are in the released position.
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