U.S. Code of Federal Regulations

Regulations most recently checked for updates: Oct 30, 2025

All TitlesTitle 49Chapter IIPart 234Subpart D - Subpart D—Maintenance, Inspection, and Testing

MAINTENANCE STANDARDS
§ 234.201 - Location of plans.
§ 234.203 - Control circuits.
§ 234.205 - Operating characteristics of warning system apparatus.
§ 234.207 - Adjustment, repair, or replacement of component.
§ 234.209 - Interference with normal functioning of system.
§ 234.211 - Security of warning system apparatus.
§ 234.213 - Grounds.
§ 234.215 - Standby power system.
§ 234.217 - Flashing light units.
§ 234.219 - Gate arm lights and light cable.
§ 234.221 - Lamp voltage.
§ 234.223 - Gate arm.
§ 234.225 - Activation of warning system.
§ 234.227 - Train detection apparatus.
§ 234.229 - Shunting sensitivity.
§ 234.231 - Fouling wires.
§ 234.233 - Rail joints.
§ 234.235 - Insulated rail joints.
§ 234.237 - Reverse switch cut-out circuit.
§ 234.239 - Tagging of wires and interference of wires or tags with signal apparatus.
§ 234.241 - Protection of insulated wire; splice in underground wire.
§ 234.243 - Wire on pole line and aerial cable.
§ 234.245 - Signs.

INSPECTIONS AND TESTS
§ 234.247 - Purpose of inspections and tests; removal from service of relay or device failing to meet test requirements.
§ 234.249 - Ground tests.
§ 234.251 - Standby power.
§ 234.253 - Flashing light units and lamp voltage.
§ 234.255 - Gate arm and gate mechanism.
§ 234.257 - Warning system operation.
§ 234.259 - Warning time.
§ 234.261 - Highway traffic signal pre-emption.
§ 234.263 - Relays.
§ 234.265 - Timing relays and timing devices.
§ 234.267 - Insulation resistance tests, wires in trunking and cables.
§ 234.269 - Cut-out circuits.
§ 234.271 - Insulated rail joints, bond wires, and track connections.
§ 234.273 - Results of inspections and tests.

REQUIREMENTS FOR PROCESSOR-BASED SYSTEMS
§ 234.275 - Processor-based systems.
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