CFR›Title 49›Subtitle B›Chapter II›Part 236›Subpart D ContainsSubject groups Inspection and Tests–StandardsCorpusDaily eCFRDisplayed edition2026-10-28Last updated2026-10-28 Subpart D—Traffic Control Systems Subject Groups Inspection and Tests Inspection and Tests Section 236.476 Rules and Instructions Rules and Instructions Section 236.426 Standards Standards Sections 236.401–236.410 Previous C Subpart C—Interlocking Next E Subpart E—Automatic Train Stop, Train Control and Cab Signal Systems