49 C.F.R. Subpart D—Traffic Control Systems
Title 49 - Transportation
The standards prescribed in §§236.201, to 236.203, inclusive, §§236.205, 236.206, 236.303, 236.307 and 236.309 to 236.311, inclusive, shall apply to traffic control systems. [49 FR 3385, Jan. 26, 1984] The control circuits for home signal aspects with indications more favorable than “proceed at restricted speed” shall be controlled by track circuits extending through entire block. Also in addition, at controlled point they may be controlled by control operator, and, at manually operated interlocking, they shall be controlled manually in cooperation with control operator. Signals at controlled point shall be so interconnected that aspects to proceed cannot be displayed simultaneously for conflicting movements, except that opposing signals may display an aspect indicating “proceed at restricted speed” at the same time on a track used for switching movements only, by one train at a time. [49 FR 3386, Jan. 26, 1984] Signals at adjacent controlled points shall be so interconnected that aspects to proceed on tracks signaled for movements at greater than restricted speed cannot be displayed simultaneously for conflicting movements. On track signaled for movements in both directions, occupancy of the track between opposing signals at adjacent controlled points shall prevent changing the direction of traffic from that which obtained at the time the track became occupied, except that when a train having left one controlled point reaches a section of track immediately adjacent to the next controlled point at which switching is to be performed, an aspect permitting movement at not exceeding restricted speed may be displayed into the occupied block.
Title 49: Transportation
PART 236—RULES, STANDARDS, AND INSTRUCTIONS GOVERNING THE INSTALLATION, INSPECTION, MAINTENANCE, AND REPAIR OF SIGNAL AND TRAIN CONTROL SYSTEMS, DEVICES, AND APPLIANCES
Subpart D—Traffic Control Systems
Standards
§ 236.401 Automatic block signal system and interlocking standards applicable to traffic control systems.
§ 236.402 Signals controlled by track circuits and control operator.
§ 236.403 Signals at controlled point.
§ 236.404 Signals at adjacent control points.
§ 236.405 Track signaled for movements in both directions, change of direction of traffic.
§ 236.406 [Reserved]
§ 236.407 Approach or time locking; where required.
Approach or time locking shall be provided for all controlled signals where route or direction of traffic can be changed.
[49 FR 3386, Jan. 26, 1984]
§ 236.408 Route locking.
Route locking shall be provided where switches are power-operated. Route locking shall be effective when the first pair of wheels of a locomotive or car passes a point not more than 13 feet in advance of the signal governing its movement, measured from the center of the signal mast or, if there is no mast, from the center of the signal.
[49 FR 3386, Jan. 26, 1984]
§ 236.409 [Reserved]
§ 236.410 Locking, hand-operated switch; requirements.
(a) Each hand-operated switch in main track shall be locked either electrically or mechanically in normal position, except:
(1) Where train speeds over the switch do not exceed 20 miles per hour;
(2) Where trains are not permitted to clear the main track;
(3) Where a signal is provided to govern train movements from the auxiliary track to the signaled track; or
(4) On a signaled siding without intermediate signals where the maximum authorized speed on the siding does not exceed 30 miles per hour.
(b) Approach or time locking shall be provided and locking may be released either automatically, or by the control operator, but only after the control circuits of signals governing movement in either direction over the switch and which display aspects with indications more favorable than “proceed at restricted speed” have been opened directly or by shunting of track circuit.
Note: Each carrier subject to this rule is hereby authorized to remove electrical or mechanical locks now installed within the purview of §236.410 when either exception (1) or (2) of the present rule is satisfied, subject to the condition that the following procedures and actions be accomplished:
1. Each carrier intending to remove a lock under the findings made herein and based on the existence of one or more of the circumstances as set forth in exception (1) or (2) as contained in the revised section, shall:
(a) Notify the FRA by letter setting forth the location of the lock involved and the specific exception on which removal is based.
(b) Include in the letter to the FRA an assurance that the excepting circumstance relied upon will not be changed without either reinstallation of the electric or mechanical lock, or approval by the FRA of the changed circumstances.
(c) Publish in its Time Table the not-to-exceed 20 miles per hour speed limit covering the area of the switch, when that is the exception relied upon; or, where exception (2) is relied upon, publish either in the Special Instructions part of its Time Table or in separate printed Special Instructions the location of each hand-operated switch where electric or mechanical lock is removed and, where train movements are made in excess of twenty (20) miles per hour, concurrently issuing specific instructions, by stating therein, that trains are not to be permitted to clear the main track at such switch.
2. Following the foregoing, and upon acknowledgment of the letter to the FRA, such acknowledgment to be made promptly as an administrative action by the FRA's Bureau of Railroad Safety, and such acknowledging letter to be retained by the carrier as authority for the removal and as a record of the exception on which relied, the lock may then be removed.
(c) Where a signal is used in lieu of electric or mechanical lock to govern movements from auxiliary track to signaled track, the signal shall not display an aspect to proceed until after the control circuits of signals governing movement on main track in either direction over the switch have been opened, and either the approach locking circuits to the switch are unoccupied or a predetermined time interval has expired.
Note: Railroads shall bring all hand-operated switches that are not electrically or mechanically locked and that do not conform to the requirements of this section on the effective date of this part into conformity with this section in accordance with the following schedule:
Not less than 33% during calendar year 1984.
Not less than 66% during calendar year 1985.
The remainder during calendar year 1986.
[33 FR 19684, Dec. 25, 1968, as amended at 49 FR 3386, Jan. 26, 1984]
Rules and Instructions
§ 236.426 Interlocking rules and instructions applicable to traffic control systems.
The rules and instructions prescribed in §§236.327 and 236.328, §236.330 to §236.334, inclusive, and §236.342 shall apply to traffic control systems.
Inspection and Tests
§ 236.476 Interlocking inspections and tests applicable to traffic control systems.
The inspections and tests prescribed in §§236.377 to 236.380, inclusive, and §§236.382, 236.383, and 236.386 shall apply to traffic control systems.
[49 FR 3386, Jan. 26, 1984]
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