ABS Automatic Block Signal System ACS Automatic Cab Signal System AMK Amtrak ATC Automatic Train Control ATS Automatic Train Stop AUTH Authority BRN Branch BRT Block Register Territory c Center C&E Conductor and Engineer COFC Container on Flat Car CONDR Conductor CP Control Point CTC Centralized Traffic Control DISPR Dispatcher DIST District DIV Division DT Double Track DTC Direct Traffic Control E East ENG Engine ENGR Engineer ESS East Siding Switch EWD Eastward FRT Freight HER Head End Restriction im Intermodal JCT junction MAX Maximum MMT Multiple Main Track MP Mile Post MPH Miles Per Hour MT Main Track mw Maintenance of Way N North NO Number NSS North Siding Switch NWD Northward OK Correct OPR Operator ORIG Originating PSGR Passenger RC Radio Channel RECD Received REG Region s South SDG Siding sss South Siding Switch SUB Subdivision SUBDIV Subdivision SUPT Superintendent SW Switch SWD Southward TOFC Trailer on Flat Car TRK Track TRN Train TWC Track Warrant Control w West wss West Siding Switch wvm Westward xo Crossover YL Yard Limits YM Yardmaster
ABS See Automatic Block Signal System. Absolute Block A length of track that no train is permitted to enter while the track is occupied by another train. Absolute Signal A block or interlocking signal without a number plate, or designated by an "A" marker. ACS See Automatic Cab Signal System. ATS See Automatic Train Stop System. Automatic Block Signal System (ABS) A series of consecutive blocks governed by block signals, cab signals, or both. The signals are activated by a train or by certain conditions that affect the block use. Automatic Cab Signal System (ACS) A system that allows cab signals and the cab warning whistle to operate automatically. Automatic Train Stop System (ATS) A system activated by wayside inductors positioned to apply the brakes automatically until the train stops. Block A length of track between consecutive block signals or between a block signal and the end of block system limits. Block Register Territory (BRT) A method of operation in non-signaled territory where trains, men, and equipment are authorized to occupy the main track in limits designated by the timetable. Block Signal A fixed signal at the entrance of a block that governs trains entering and using that block. Block System A block or series of consecutive blocks within ABS, ACS, CTC, or interlocking limits. BRT See Block Register Territory. Cab Signal A signal in the engineer's compartment or cab that indicates a condition affecting train movement. Cab signals are used with interlocking or block signals or without block signals. Cars Railroad cars. Centralized Traffic Control (CTC) A block system that uses block signal indications to authorize train movements. Conductor Employee in charge of train or yard movement. Control Operator Employee assigned to operate a CTC or interlocking control machine or authorized to grant track permits. Control Point The location of absolute signals controlled by a control operator. Controlled Siding A siding within CTC or interlocking limits where a signal indication authorizes the siding's use. Controlled Signal An absolute signal controlled by a control operator. Crossings at Grade Crossings that intersect at the same level. Crossover A track connection between two adjacent tracks. CTC See Centralized Traffic Control. Current of Traffic The movement of trains in one direction on a main track, as specified by the rules. Direct Traff ic Control (DTC) A DTC block or a series of DTC blocks where the train dispatcher authorizes track occupancy. Distant Signal A fixed signal outside a block system that govems the approach to a block signal, interlocking signal, or switch point indicator. A distant signal does not indicate conditions that affect track use between the distant signal and block or interlocking signals or between the distant signal and switch point indicator. A distant signal is identified by a "D." Double Track Two main tracks where the current of traffic on one track is in a specified direction and in the opposite direction on the other. Dual Control Switch A power-operated switch, moveable point frog, or derail that can also be operated by hand. DTC See Direct Traffic Control. DTC Block A length of main track specified by name. DTC block name and limits are identified by wayside signs reading, "Begin (name) Block" and "End (name) Block" and by mile post location in the timetable. Electric Switch Lock An electrically controlled lock that restricts the use of a hand-operated switch or derail. Engine A unit propelled by any form of energy or more than one of these units operated from a single control. Engines are used in train or yard service. Rules that apply to engines also apply to cab control cars. Engineer Also includes student engineers, firemen, and hostlers. Equipment Railroad equipment. Fixed Signal A signal that is fixed to a location permanently and that indicates a condition affecting train movement. flagman Any employee providing flag protection. Foreman Employee in charge of work. Interlocking Signal appliances that are interconnected so that each of their movements follows the other in a proper sequence. Interlockings may be operated manually or automatically. Interlocking Limits The tracks between outer opposing absolute signals of an interlocking. Interlocking Signals The fixed signals of an interlocking that govern trains using interlocking limits. Main Track A track extending through yards and between stations that must not be occupied without authority or protection. Men Railroad employees. Multiple Main Tracks Two or more main tracks that are used according to the timetable. Pilot An employee assigned to a train to assist an engineer or conductor who is unfamiliar with the rules or the portion of railroad the train will operate on, Proceed Indication Any block signal indication that allows a train to proceed without stopping. Reverse Movement A movement opposite the authorized direcfion. Siding A track connected to the main track and used for meeting or passing trains. Location of sidings are shown in the timetable. Signal Aspect The appearance of a fixed or cab signal. Signal Indication The action required by the signal aspect. Single Track A main track where trains are operated in both directions. Special Instructions Instructions contained in the timetable or other publication. Spring Switch A switch with a spring mechanism that retums the switch points to the original position after they are trailed through. Station A place designated by name in the timetable station column. Switch Point Indicator A light type indicator used during movement over certain switches to show that switch points fit properly. Timetable A publication with instructions On train, engine, or equipment movement. It also contains other essential information. Track Bulletin A notice of conditions affecting train movement. It may also authorize movement against the current of traffic where Rule 9.14 (Movement with the Current of Traffic) is in effect. Track Occupancy Indicator An indicator that tells whether a length of track is occupied or not. Trackside Warning Detector A device that indicates conditions such as overheated journals, dragging equipment, excess dimensions, shifted loads, high water, or slides. Track Warrant Control (TWC) A method to authorize train movements or protect men or machines on a main track within specified limits in a territory designated by the timetable. Train One or more engines coupled, with or without cars, displaying a marker, and authorized to operate on a main track. A term that when used in connection with speed restrictions, flag protection, and the observance of all signals and signal rules also applies to engines. Trainnmen Conductors, assistant conductors, brakemen, yard engine foremen, switchmen, and yard helpers. TWC See Track Warrant Control. Variable Switch A switch identified by a "V" or a bowl painted yellow. When trailed through, the switch points remain lined in the posifion they were forced. Yard A system of tracks, other than main tracks and sidings, used for making up trains, storing cars, and other purposes. Yard Limits A portion of main track designated by yard limit signs and timetable special instructions or a track bulletin.