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What are Sighting Boards in Railway tracks?  
11 Answers
Feb 20 2012 (11:58)
General

Entry# 1016     
Anonymous1218~
What are Sighting Boards in Railway tracks?

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May 08 2012 (12:01)
Blog Post# 419250-0     
Anil Kumar Garg   Added by: soumitra.chawathe^~  May 08 2012 (12:06)
Basic Indian Railway Signals and Signs.
By Mark Vogel

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Feb 20 2012 (11:22)
Blog Post# 353711-1     
HarshaG   Added by: soumitra.chawathe^~  May 08 2012 (12:09)
Block Limits
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For stations (usually class 'B') on double line sections in absolute block or automatic block territory (and usually with modified lower-quadrant, upper-quadrant, or MACL signalling) a square or rectangular yellow sign with two intersecting black diagonal stripes, and with the words 'Block Section Limit' is provided 180m in advance of the Home signal; it marks the fouling point of the rearmost trailing points connecting to the station.
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The acronym 'BSL' may appear instead. The legend faces the station.
A single white lamp may appear within the sign through a hole in the sign above the center.
source:IRFCA

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Feb 20 2012 (11:51)
Blog Post# 353711-4     
HarshaG   Added by: soumitra.chawathe^~  May 08 2012 (12:09)
Shunting limits
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A rectangular yellow board with a black cross at the top and the words 'Shunting Limit' (or 'S/L') indicates the end of a shunting section. This sign normally also has black and white bands on it, and white lamps attached on both sides (although the words are only on the side towards the station). This is usually provided at class 'B' stations on single-line sections (sometimes double-line) where shunting is permitted on the block section and advanced starters are not provided.
The
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sign is placed 400m to the rear of the first stop signal of the station in lower-quadrant signalling (180m in modified lower-quadrant, upper-quadrant, and MACL systems). A single white lamp may appear through a hole in the sign above the center.
source:IRFCA

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Feb 20 2012 (11:53)
Blog Post# 353711-5     
HarshaG   Added by: Anonymous1218~  Feb 20 2012 (11:58)
Sighting Boards
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The most common kind of signal sighting board is a rectangular reflective board with a circle and two horizontal lines, yellow on black. This warns the driver of a signal ahead. The next signal should be visible from this point onwards, although in practice experienced drivers spot the signals well before the sighting boards are crossed. In lower quadrant territory, there are often two sighting boards used for signals. One, as described, is the goods signal sighting board and is placed 1400m before the signal. The other is the
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passenger signal sighting board intended for use by drivers of passenger trains and is usually placed about 1000m before the signal. The latter consists of a rectangular reflective board with alternate black and yellow diagonal stripes.

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Feb 20 2012 (11:55)
Blog Post# 353711-6     
HarshaG   Added by: soumitra.chawathe^~  May 08 2012 (12:09)
Stop Indicator
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A rectangular board with red and white bands. It is mounted on a post with alternating red and white bands. At night the sign is illuminated by two red lamps. This is used for temporary or permanent engineering restrictions which call for trains to come to a dead stop before proceeding.
Some stop indicators are used to mark the spot
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beyond which a locomotive must not proceed when a signal ahead is at danger. These include vertical poles with 'STOP' spelled out in black on yellow, or rectangular yellow boards with 'STOP' on them in black. The poles usually have horizontal yellow and black stripes. A single white lamp may appear within the sign. These signs may appear on the right or on both sides of the track. At stations these stop signs are used to position the train correctly along the platform. (Sometimes, an indication board (see below) is used instead, with a message (black on yellow) such as 'Stop here when main signal is at danger', or 'Engine stop here'.)
source:IRFCA

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Feb 20 2012 (11:58)
Blog Post# 353711-9     
HarshaG   Added by: soumitra.chawathe^~  May 08 2012 (12:09)
Caution Indicator
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Arrow-shaped boards pointing to the left or right. These indicate special restrictions on the track (temporary or permanent engineering restrictions) and caution orders in effect; the direction of the arrow indicates which track the restriction applies to. These boards are usually reflective yellow with black markings. The post on which it is mounted has alternating black and white bands. At night, sometimes two yellow lamps illuminate this indicator, although such lighting is not common and perhaps used more for caution indicators that are installed permanently. More often, the reflective
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paint on the indicator suffices for visibility at night. The caution indicator is usually placed 700m before a Speed Indicator board (see below) and 800m before the actual point of permanent way work or other cause of restriction. Drivers have to slow down to the speed indicated on the speed restriction board by the time they reach it.
Other indicators include 'CP', or 'CG' on small white circular boards. These are caution indicators for passenger and goods trains, respectively. A 'C/T' indicator has been spotted in a few cases just before the entrance to a tunnel.
source: IRFCA

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Feb 20 2012 (12:00)
Blog Post# 353711-10     
HarshaG   Added by: soumitra.chawathe^~  May 08 2012 (12:10)
Termination Indicators
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T/P, T/G, or T/BOXN (painted on a yellow circular board) : Termination of speed zone for, respectively, passenger trains, goods trains, and goods trains with BOXN wagon rakes. In urban areas similar signs such as T/EMU, T/EMU-9, etc., may be seen (termination of speed limit for EMU rakes, EMU rakes with 9 coaches, respectively). Other termination indicators seen include T/PG (for both passenger and goods trains, seen on ECoR), T/P24 (for 24-coach or longer passenger trains), and T/L (for local, i.e., suburban trains, usually EMU or DMU trains). The
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Hyderabad area MMTS system uses a T/M sign for its trains. T/R is sometimes seen for railbuses. Occasionally, the sign T by itself is shown to indicate a termination of speed limit for all trains. A T/Raj sign was in use for Rajdhani trains when they were first introduced but is no longer used now. WR used T/Raj indicators for the 8-coach Bombay - New Delhi Rajdhani, and its EMUs used the same sign as a termination indicator.
source:IRFCA

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Feb 20 2012 (12:04)
Blog Post# 353711-11     
HarshaG   Added by: soumitra.chawathe^~  May 08 2012 (12:10)
Speed Limit Number on triangular yellow board : speed limit in km/h. 'KMPH' or 'KM/H' may optionally appear below the number. Black text.
Sometimes the board has additional text, for instance 'RAJDHANI ONLY' may appear at the bottom, indicating that the speed is restricted for the Rajdhani service on this stretch.
source:IRFCA

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Feb 20 2012 (12:05)
Blog Post# 353711-13     
HarshaG   Added by: soumitra.chawathe^~  May 08 2012 (12:10)
Speed Limit - Rajdhani/Shatabdi
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Number on blue board: indicates a special speed limit (in km/h) for Rajdhani and Shatabdi trains. Text is in white. (But see above -- sometimes the normal speed limit board is used with additional annotations for these trains.)

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Feb 20 2012 (12:09)
Blog Post# 353711-14     
HarshaG   Added by: soumitra.chawathe^~  May 08 2012 (12:10)
Whistle Indicators
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'W', or 'W/L' on a square yellow board. The 'W' is a general whistle indicator while the 'W/L' stands for Whistle for Level Crossing. The latter is also seen in Hindi with the characters 'see/pha' == 'seetee bajao - phatak'). Usually provided on approach to unmanned level crossings (and for manned level crossings without a clear view) about 250m away from the level crossing. Similarly, a 'W/B' sign is seen (less often) on approach to a bridge.
source:IRFCA

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Feb 20 2012 (12:12)
Blog Post# 353711-15     
HarshaG   Added by: soumitra.chawathe^~  May 08 2012 (12:11)
Level Crossing indicator
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A black 'L' on a square yellow board indicates approach to a level crossing.
source:IRFCA
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