Block - A length of track of defined limits, the use of which is governed by block signals, block-limit signals automatic speed control or any combination thereof., Absolute Block - A block established between block stations, block limit stations, interlockings or any combination thereof which must not be occupied by more than 1 train except as provided by the rules., Automatic Block Signal System - A blocked signal system wherein the use of each block is governed by an automatic block signal, the cab signal indicator or both., Block Signal System - A series of consecutive blocks., Manual Block signal system: - A block signal system wherein the use of each block is governed by the block signals control manually, by block-limit signals or both, upon information received by telephone, radio or other means of communication., Automatic Speed Control Systems (ASC), while operating under a speed restriction, the speed of the train exceeds the predetermined rate. The application will continue until the train is either bought to a stop or, under the control of the engineer, its speed is reduced to the predetermined rate. - A system so arranged that its operation will automatically result in the following: a full service application of the train breaks if, while operating under a speed restriction, the speed of the train exceeds the predetermined rate. The application will continue until the train is either brought to a stop or, under the control of the engineer, its speed is reduced to the predetermined rate., Speed Controlled Train: - A train equipped with the following speed control apparatus, a cab signal indicator, sealed application valve or switch, audible warning device and acknowledging switch, inoperative condition for the direction in which it is to move., Engine (ENG):  - A unit propelled by any form of energy or a combination of units operated from a single control, used in any road or yard service., Multiple Unit Equipment: - Equipment capable of being propelled by electrical energy through the use of third rail, Track car (TC): - A roadway maintenance machine, not classified as an engine, which is operated on track for inspection or maintenance. It may not shunt track circuits or operate signals and will be governed by rules and special instructions for trains other than passenger trains., Interlocking (INT): - An arrangement of signals and signal appliances so interconnected that their movement must succeed each other in proper sequence and for which interlocking rules are in effect., Interlocking limits: - The tracks between the extreme opposing home signals of an interlocking., Pilot: - An employee assigned to a train or track car when the engineer, conductor or track car driver is not qualified on the physical characteristics or rules of the railroad or portion of the railroad over which the movement is to be made., Aspect: - The appearance of a fixed signal which conveys an indication has viewed from the direction of an approaching train; the appearance of a cab signal indicator as viewed in the engine control compartment., Block- Limit Signal: - A fixed signal indicating the limit of the block, the use of which is governed by manual block signal system rules., Block Signal: - A fixed signal or a hand signal in the absence of a fixed signal, at the entrance to a block that governs trains using that block., Cab Signal Indicator: - A signal indicator located in the engine control compartment displaying the maximum speed for the movement of the train. It will be used in conjunction with interlocking signals in either in conjunction with or in lieu of block signals., Distant Signals: - A fixed signal used to govern the approach to a home signal., Fixed Signal: - A signal of a fixed location indicating a condition which affects the movement of a train., Home Signal: - A fixed signal that displays stop signal as its most restrictive aspect and governs the entrance to a route on block.,

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