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What are Sighting Boards in Railway tracks? 11 Answers What are Sighting Boards in Railway tracks? May 08 2012 (12:01) Blog Post# 419250-0 Anil Kumar Garg Added by: soumitra.chawathe^~ May 08 2012 (12:06) Block Limits ~~~~~~~~ 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. ... more... Shunting limits ~~~~~~~~~ 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... more... Sighting Boards ~~~~~~~~~~ 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... more... Stop Indicator ~~~~~~~~~ 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... more... Caution Indicator ~~~~~~~~~~~ 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... more... Termination Indicators ~~~~~~~~~~~~~~ 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... more... 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 Whistle Indicators ~~~~~~~~~~~ '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 |