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Notes

49 C.F.R. §§ 236.309–236.311

3 sections in range

§236.309. Loss of shunt protection; where required.

49 C.F.R. § 236.309

(a)
A loss of shunt of 5 seconds or less shall not permit an established route to be changed at an automatic interlocking.
(b)
A loss of shunt of 5 seconds or less shall not permit the release of the route locking circuit of each power-operated switch hereafter installed.
Notes, amendments, and revision history

Amendments

[49 FR 3385, Jan. 26, 1984]

Authority

Authority: 49 U.S.C. 20102-20103, 20107, 20133, 20141, 20157, 20301-20303, 20306, 20501-20505, 20701-20703, 21301-21302, 21304; 28 U.S.C. 2461 note; and 49 CFR 1.89.

Source

Source: 33 FR 19684, Dec. 25, 1968, unless otherwise noted.

Amendments

[49 FR 3385, Jan. 26, 1984]

§236.310. Signal governing approach to home signal.

49 C.F.R. § 236.310

A signal shall be provided on main track to govern the approach with the current of traffic to any home signal except where the home signal is the first signal encountered when leaving yards or stations and authorized speed approaching such signal is not higher than slow speed. When authorized speed between home signals on route governed is 20 miles per hour or less, an inoperative signal displaying an aspect indicating “approach next signal prepared to stop” may be used to govern the approach to the home signal.
Notes, amendments, and revision history

Authority

Authority: 49 U.S.C. 20102-20103, 20107, 20133, 20141, 20157, 20301-20303, 20306, 20501-20505, 20701-20703, 21301-21302, 21304; 28 U.S.C. 2461 note; and 49 CFR 1.89.

Source

Source: 33 FR 19684, Dec. 25, 1968, unless otherwise noted.

§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.

49 C.F.R. § 236.311

(a)
The control circuits for aspects with indications more favorable than “proceed at restricted speed” shall be selected through track relays, or through devices that function as track relays, for all track circuits in the route governed.
(b)
At automatic interlocking, signal control circuits shall be selected (1) through track relays, or devices that function as track relays, for all track circuits in the route governed and in all conflicting routes within the interlocking; (2) through signal mechanism contacts or relay contacts closed when signals for such conflicting routes display “stop” aspects; and (3) through normal contacts of time releases, time element relays, or timing devices for such conflicting routes, or contacts of relays repeating the normal position or normal state of such time releases, time element relays, or timing devices.
Notes, amendments, and revision history

Amendments

[49 FR 3385, Jan. 26, 1984]

Authority

Authority: 49 U.S.C. 20102-20103, 20107, 20133, 20141, 20157, 20301-20303, 20306, 20501-20505, 20701-20703, 21301-21302, 21304; 28 U.S.C. 2461 note; and 49 CFR 1.89.

Source

Source: 33 FR 19684, Dec. 25, 1968, unless otherwise noted.

Amendments

[49 FR 3385, Jan. 26, 1984]