CFR›Title 49›Subtitle B›Chapter II›Part 236›Subpart C ContainsSubject groups Inspection and Tests–StandardsCorpusDaily eCFRDisplayed edition2026-05-18Last updated2026-05-18 Subpart C—Interlocking Subject Groups Inspection and Tests Inspection and Tests Sections 236.376–236.387 Rules and Instructions Rules and Instructions Sections 236.326–236.342 Standards Standards Sections 236.301–236.314 Previous B Subpart B—Automatic Block Signal Systems Next D Subpart D—Traffic Control Systems