Standards

Sections

• 236.301
  § 236.301 Where signals shall be provided.
• 236.302
  § 236.302 Track circuits and route locking.
• 236.303
  § 236.303 Control circuits for signals, selection through circuit controller operated by switch points or by switch locking mechanism.
• 236.304
  § 236.304 Mechanical locking or same protection effected by circuits.
• 236.305
  § 236.305 Approach or time locking.
• 236.306
  § 236.306 Facing point lock or switch-and-lock movement.
• 236.307
  § 236.307 Indication locking.
• 236.308
  § 236.308 Mechanical or electric locking or electric circuits; requisites.
• 236.309
  § 236.309 Loss of shunt protection; where required.
• 236.310
  § 236.310 Signal governing approach to home signal.
• 236.311
  § 236.311 Signal control circuits, selection through track relays or devices functioning as track relays and through signal mechanism contacts and time releases at automatic interlocking.
• 236.312
  § 236.312 Movable bridge, interlocking of signal appliances with bridge devices.
• 236.313
  § 236.313 [Reserved]
• 236.314
  § 236.314 Electric lock for hand-operated switch or derail.