StacksVerified U.S. regulatory reference

49 CFR §236.553

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Seal shall be maintained on any device other than brake-pipe cut-out cock (double-heading cock), by means of which the operation of the pneumatic portion of automatic train-stop or train-control apparatus can be cut out.