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31 Cards in this Set
- Front
- Back
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Automatic interlocking plant
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FRA 236. 750 An arrangement of signals... which functions through the exercise of inherent powers (train on approach) as distinguished from those whose functions are controlled manually, and which are so interconnected by means of electric circuits that their movements must succeed each other in proper sequence, train movements over all routes being governed by signal indication.
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Manual interlocking plant
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FRA 236.751 An arrangement of signals and signal appliances operated from an interlocking machine and so interconnected by means of mechanical and/or electric locking that their movement must succeed each other in proper sequence, train movements over all routes being governed by signal indication.
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Electric Locking
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FRA 236.761 The combination of one or more electric locks and controlling circuits by means of which levers of an interlocking machine, or switches or other units operated in connection with signaling and interlocking, are secured against operation under certain conditions.
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Interlocking Limits
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FRA 236.753 The tracks between the home signals of an interlocking.
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Use of Signals
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FRA Rule 236.301 Signals shall be provided to govern train movements into and through interlocking limits...
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Track Circuits
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Track Circuits and *route locking shall be provided not more than 13 feet in advance of the signal...
*Route Locking only in effect when operable device (POSM, movable point frog, power operated derail) is within interlocking limits. |
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Dead Section
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FRA 236.55 Where dead Section exceeds 35 ft, special circuit shall be installed.
Where shortest outer wheel base of locomotive is less than 35 ft, the maximum length of the dead Section shall not exceed the length of the outer wheel base of such locomotive unless special circuit is used. BNSF....less than 30 ft. |
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Locking Requirements
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FRA Rule 236.304 Mechanical locking, or the same protection effected by means of circuits, shall be provided.
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Mechanical Locking
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FRA 236.765 an arrangement of locking bars, dogs, tappets, cross locking and other apparatus by means of which interlocking is effected between levers of an interlocking machine and so interconnected that their movements must succeed each other in a predetermined order.
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Approach or Time Locking
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FRA 236.305 "Approach or Time Locking shall be provided in connection with signals displaying aspects with indications more favorable than proceed at restricted speed"
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Opposing signals
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FRA 236.808 Roadway signals which govern movements in opposite directions on the same track. Example- signal 6 and signal 7
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Conflicting Signals
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FRA Rule 236.808 "Mechanical or electric locking circuits shall be installed to prevent signals from displaying aspects which permit conflicting movements. .."
Example - signal 2 and signal 6 |
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Conflicting Routes
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FRA 236.796
Two or more routes, opposing, converging, or intersecting, over which movements cannot be made simultaneously without possibility of collision. |
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Loss of Shunt
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FRA Rule 236.309
At automatic Interlocking, a loss of shunt of 5 seconds or less shall not permit an established route to be changed. |
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Approach Signal Requirement
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FRA Rule 236.310
"A signal shall be provided on main track to govern the approach with the current of traffic to any home signal..." |
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Design Requirements - Track Circuits
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FRA Rule 236.311
At automatic Interlocking, signal signal control circuit shall be selected:Through track relays for all track circuits in the route governed and in all conflicting routes within interlocking limits or through repeating relays for such track relays. |
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Design Requirements- Signal Repeaters
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FRA Rule 236.311
...At automatic Interlocking, signal control circuit shall be selected: Through signal mechanism contacts or relay contacts closed when signal for such conflicting routes display stop aspects. |
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Design Requirements - Timers
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FRA Rule 236.311
At automatic Interlocking, signal control circuit shall be selected : Through normal contacts of time releases, time element relays, or timing devices for such conflicting routes. |
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Automatic Interlocking Plant
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1. Occupy Approach Track
2. Request Route 3. Establish Route 4. Lock Route 5. Clear Signal 6. Light Signal 7. Pick stick 8. Release Route 9. Unlock Route 10. Release Stick |
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Occupy Approach Track
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WAZTR⬇WZTR⬇ WZAR⬇ WZAPR⬇
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Request Route (signal 2)
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2-3 RR ⬆
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Establish Route
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2-3 RPR⬆
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Lock Route
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2-3 ASR⬇
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Clear Signal
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2HR⬆ 2HPR⬆75CTR↔
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Light Signal(s)
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2LOR⬆WCFTPR⬆
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Clear 1 Signal
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(showing when signal 1 goes to clear)
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Train passes signal 1
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Pick Stick
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ZTR⬇ZTPR⬇2HR⬇2HPR⬇3SR⬆
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Release Route
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2-3RR⬇2-3RPR⬇
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Unlock Route
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EZTR⬇EZAR⬇EZAPR⬇2-3ASR⬆
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Release Stick
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3SR⬇
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