---
kind: "unit"
title: "49"
title_heading: "Transportation"
key: "subtB/chII/part236"
level: "part"
label: "Part 236"
heading: "Rules, Standards, and Instructions Governing the Installation, Inspection, Maintenance, and Repair of Signal and Train Control Systems, Devices, and Appliances"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/49/subtB-chII-part236"
sections_count: 346
---

# Part 236 — Rules, Standards, and Instructions Governing the Installation, Inspection, Maintenance, and Repair of Signal and Train Control Systems, Devices, and Appliances

Title 49 C.F.R. — Transportation › Subtitle B — Other Regulations Relating to Transportation › Chapter II — Federal Railroad Administration, Department of Transportation

## Sections

- [§236.0. Applicability, minimum requirements, and penalties.](/cfr/49/236.0.md)

## Contents

- [Subpart A — Rules and Instructions: All Systems](/cfr/49/subtB-chII-part236-subpartA.md)
- [Subpart B — Automatic Block Signal Systems](/cfr/49/subtB-chII-part236-subpartB.md)
- [Subpart C — Interlocking](/cfr/49/subtB-chII-part236-subpartC.md)
- [Subpart D — Traffic Control Systems](/cfr/49/subtB-chII-part236-subpartD.md)
- [Subpart E — Automatic Train Stop, Train Control and Cab Signal Systems](/cfr/49/subtB-chII-part236-subpartE.md)
- [Subpart F — Dragging Equipment and Slide Detectors and Other Similar Protective Devices](/cfr/49/subtB-chII-part236-subpartF.md)
- [Subpart G — Definitions](/cfr/49/subtB-chII-part236-subpartG.md)
- [Subpart H — Standards for Processor-Based Signal and Train Control Systems](/cfr/49/subtB-chII-part236-subpartH.md)
- [Subpart I — Positive Train Control Systems](/cfr/49/subtB-chII-part236-subpartI.md)