Federal Railroad Administration, DOT § 235.7
Federal Railroad Administration, DOT § 235.7 railroads that operate on standard gage (5) Removal of an intermittent auto- track which is part of the general rail- matic train stop system in conjunction road system of transportation. with the implementation of a positive (b) This part does not apply to rail train control system approved by FRA rapid transit operations conducted over under subpart I of part 236 of this chap- track that is used exclusively for that ter. purpose and that is not part of the gen- (b) When the resultant arrangement eral system of railroad transportation. will comply with part 236 of this title, it is not necessary to file for approval § 235.5 Changes requiring filing of ap- to decrease the limits of a system as plication. follows: (a) Except as provided in § 235.7, ap- (1) Decrease of the limits of an inter- plications shall be filed to cover the locking when interlocked switches, de- following: rails, or movable-point frogs are not in- (1) The discontinuance of a block sig- volved; nal system, interlocking, traffic con- (2) Removal of electric or mechanical trol system, automatic train stop, lock, or signal used in lieu thereof, train control, or cab signal system or from hand-operated switch in auto- other similar appliance or device; matic block signal or traffic control (2) The decrease of the limits of a territory where train speed over the block signal system, interlocking, traf- switch does not exceed 20 miles per fic control system, automatic train hour; or stop, train control, or cab signal sys- (3) Removal of electric or mechanical tem; or lock, or signal used in lieu thereof, (3) The modification of a block signal from hand-operated switch in auto- system, interlocking, traffic control matic block signal or traffic control system, automatic train stop, train territory where trains are not per- control, or cab signal system.
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