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CAMTECH/S/2001/Basic Concepts/SCR-4 1 COURSE CONTENTS 1. Knowledge and necessity of Signals – Fail Safe Feature of Signaling System 2. Definition of Signaling terms as given G & SR 3. Concept of LQ; UQ Signaling; Colour Light Signals 4. Overlaps; Braking distances: Sighting Distance 5. Location of Signals 6. Subsidiary Signals 7. Markers, Boards, Signs, etc. 8. Isolation, Slip Siding & Catch Siding 9. Simultaneous Reception and dispatch of trains 10. Classification of stations – Minimum signaling equipments required at each class of station 11. Standards of Inter Locking – Minimum Signaling equipments required at each standard of inter locking. 12. Level crossing gates 13. Inter cabin control 14. System of train working (Block Working) 15. Control of outlying sidings through Block Instruments 16. Station Working rules 17. Signaling Plan CAMTECH/S/2001/Basic Concepts/SCR-4 2 Lesson Plan Long Course No. of Hours Teaching Aids Topic Theory Practicals Theory Practicals Knowledge and necessity of 1 signals – fail safe feature of signaling system. Definition of signaling terms as 3 given in G & SR Concept of LQ, UQ signaling color 2 OHP Wallchart light signals Overlaps, braking distance, 2 OHP sighting distance Location of signals 3 2 OHP Wallchart Model Room Subsidiary signals 2 2 OHP Wallchart Model Room Markers, Boards, Signs, etc 3 2 OHP Wallchart Model Room Isolation, slip siding, catch siding 2 2 OHP Model Room Simultaneous reception and 2 2 Model Room dispatch of trains Classification of station – minimum 4 2 Block board Model Room signaling equipments required at OHP each class of station Standards of signaling – minimum 4 2 OHP Wallchart Model Room signaling equipments required each standard of signaling Level crossing gates 2 2 OHP Model Room Inter cabin control 2 2 OHP Model Room System of train working (block 4 2 OHP Wallchart Model Room working) Block instruments, methods of 6 3 OHP Wallchart Model Room block working, control of outlying sidings Station working rules 2 2 OHP Open Line Signaling plan 2 1 OHP Wallchart Open Line CAMTECH/S/2001/Basic Concepts/SCR-4 3 Lesson Plan Short Course Minutes Teaching Aids Topic Theory Practicals Theory Practicals Knowledge and necessity of 20 signals – fail safe feature of signaling system. Definition of signaling terms as 30 OHP given in G & SR Concept of LQ, UQ signaling color 30 OHP Wallchart light signals Overlaps, braking distance, 20 OHP sighting distance Location of signals 20 15 OHP Wallchart Model Room Subsidiary signals 20 20 OHP Wallchart Model Room Markers, Boards, Signs, etc 30 OHP Wallchart Isolation, slip siding, catch siding 25 30 OHP Model Room Simultaneous reception and 20 OHP dispatch of trains Classification of station – minimum 30 30 OHP Wallchart Model Room signaling equipments required at each class of station Standards of signaling – minimum 60 30 OHP Wallchart Model Room signaling equipments required each standard of signaling Level crossing gates 30 OHP Wallchart Inter cabin control 20 OHP Wallchart System of train working (block 60 60 OHP Wallchart Model Room working) Block instruments, methods of 30 30 OHP Model Room block working, control of outlying sidings Station working rules 30 OHP Signaling plan 30 OHP CAMTECH/S/2001/Basic Concepts/SCR-4 4 NECESSITY OF SIGNALS Signaling Concepts : Railway vehicles move on steel rail track and engines, wagons and coaches are provided with flanged steel wheels. The rolling of steel wheels on the steel rail has the least friction and therefore, it is the most efficient means of locomotion. Unlike road vehicles, railways have no capacity to steer away. They have to follow a fixed path, as guided by these rails. They are required to follow one another. Precedence and crossings can be arranged only at station. Drivers of a locomotive has only control over the speed of the train, he can start and stop. This communication to the driver to proceed or to stop is through signals. What are Signals : Signal is medium to convey a particular predetermined meaning in non-verbal form. Signals of non-verbal form are also used in road transport, navy and air traffic control etc. Fixed Signals : A signal of fixed location indicating the condition affecting movement of train. It includes Semaphore arm, or a disc or fixed light used by day or night. CAMTECH/S/2001/Basic Concepts/SCR-4 5 Semaphore is a Greek word. SEMA stands for Sign, PHERO means bear. Semaphore signal is rectangular or fish tailed at the end. Fixed on a vertical post, kept horizontal. Easily distinguishable from longer distances. There are three methods of display : i) Vertical - Parallel to post. ii) Midway Position - below horizontal. iii) Midway Position - above horizontal. Various Forms of Signals : Signals Visual Audible Detonators Voice Whistle Movable Fixed Flare Semaphore CLS Position Light LQ UQ 2 Aspect Multiple Aspect CAMTECH/S/2001/Basic Concepts/SCR-4 6 DEFINITIONS (As per GR 1.02) ACT :Means the Indian Railways Act, 1989. ADEQUATE DISTANCE :Means the distance sufficient to ensure Safety. APPROACH LIGHTING :Means an arrangement in which the lighting of signals is controlled automatically by the approach of a train. APPROVED SPECIAL INSTRUCTIONS : Means special instructions approved of or prescribed by the Commissioner of Railway Safety. AUTHORISED OFFICER :Means the person who is duly empowered by general or special order of the Railway. Administration, either by name or by virtue of his office, to ensure instructions or to do any other thing. AUTHORITY TO PROCEED :Means the authority given to the driver of a train, under the system of working, to enter the block section with his train. CAMTECH/S/2001/Basic Concepts/SCR-4 7 AXLE COUNTER :Means an electrical device which, when provided at two given points on the track proves by counting axles in and counting axles out. Whether the section of the track between the said two points is clear or occupied. BLOCK BACK :Means to dispatch a message from a block station intimating to the block station immediately in rear on a double line or to the next block station on either side on a single line, that the block section is obstructed or is to be obstructed. BLOCK FORWARD :Means to dispatch a message from a block Station on a double line intimating to the block station immediately in advance the fact that the block section in advance is obstructed or is to be obstructed. BLOCK SECTION :Means that portion of the running line between two block stations on to which no running train may enter until line clear has been received from the block station at the other end of the block station. CAMTECH/S/2001/Basic Concepts/SCR-4 8 COMMISSIONER OF RAILWAY SAFETY : Means a Commissioner of Railway safety appointed to exercise any functions under the act and includes the chief Commissioner of Railway safety. CONNECTIONS : When used with reference to a running line, means the points and crossings, or other appliances used to connect such line with other lines to cross it. DIRECTION OF TRAFFIC : a). On a double line, the direction for which the line is signaled. b). On a single line, the direction for the time being established, under the system of working to allow trains to move in that direction. FACING AND TRAILING POINTS : Points are facing or trailing in accordance with the direction of a train or vehicles moves over them. Points are said to be facing points when by their operation a train CAMTECH/S/2001/Basic Concepts/SCR-4 9 approaching them can be directly diverted from the line upon which it is running. FIXED SIGNAL : Means a signal of fixed location indicating a condition affecting the movement of a train and includes a Semaphore arm or disc or fixed light for use by day and fixed light for use by night. FOULING MARK : Means the marks at which the infringement of fixed standard dimensions occurs, where two lines cross or join one another. INTER LOCKING : Means an arrangement of signals, points and other appliances, operated from a panel or lever frame, so inter connected by Mechanical locking or Electrical locking or both that their operation must take place in proper sequence to ensure safety. INTERMEDIATE BLOCK POST : Means a class “C” station on a double line, remotely controlled from the block station in rear. CAMTECH/S/2001/Basic Concepts/SCR-4 10 INTERMEDIATE BLOCK SIGNALLING : Means an arrangement of signalling on double line in which a long block section is split in two portions each constituting a separate block section by providing an Intermediate Block post. ISOLATION : Means an arrangement, secured by the settings of points or other approved means to protect the line so isolated from the danger of obstruction from other connected line or lines. LAST STOP SIGNAL : Means the fixed stop signal of a station controlling the entry of a train into the next block station. LEVEL CROSSING : Means the intersection of road with railway track at the same level. LINE CLEAR : Means the permission given from a block station to a block station in rear for a train to leave the latter and approach the former, or CAMTECH/S/2001/Basic Concepts/SCR-4 11 the permission obtained by a block station from a block station in advance for a train to leave the former and proceed towards the latter. MAIN LINE : Means the line ordinarily used for running trains through and between stations. MULTIPLE ASPECT SIGNALLING : Means a signalling arrangement in which signal displays at any one time any one of the three or more aspects and in which the aspect of every signal is pre-warned by the aspect of the previous signal or signals. OBSTRUCTION : And its cognate expressions include a train, vehicle or obstacle on or fouling a line, or any condition, which is dangerous to trains.