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Gour Express: আমের শহর মালদা থেকে রোজ যায় শিয়ালদা - Joydeep Roy
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What does the Sigma (Σ) sign mean in respect of track markings? 2 Answers What does the Sigma (Σ) sign mean in respect of track markings? Oct 28 2017 (22:59) Blog Post# 2230241-2 12658ChennaiMail^~ Added by: soumitra.chawathe^~ Nov 09 2017 (12:42) What is that sigma symbol denotes? Oct 29 2017 (00:16) Blog Post# 2230241-3 TheMadrasMail~ Added by: soumitra.chawathe^~ Nov 09 2017 (12:42) It is a retro-reflective strip ( Reflects light back in the same direction as it is incident). It is placed two masts before signals, generally in fog prone areas, but can be placed in other places too. It is a visible sign that tells the LP that there is a signal up ahead. In this pic you can see the signal hidden just behind the mast with the sigma strip. As the signal is on a curve, the sigma strip will be used to indicate that there is a signal a short distance away. | ||
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