Chennai Metro|CMRL uses wireless tech for perfect track alignment


Chennai: In an attempt to achieve perfect alignment of tracks, metro rail has adopted wireless technology from a US-based company that set alignment for bullet train tracks in China. Working in association with Larsen and Toubro, a small team from Trimble, which has an R&D unit in Chennai, uses equipment that can scan alignment of tracks after they are laid and upload information wirelessly on to the system. It saves time, cost and eliminates human error.

Conventionally, staff on a trolley pushed along the tracks check for alignment. Chennai Metro Rail Ltd (CMRL) contractors have brought in the latest technology as the tracks are on elevated lines and in tunnels. A senior official rail said the technology was selected based on the requirement given. “We specified high level of accuracy to ensure safety of trains.”

Trimble managing director (SAARC Region) Rajan Aiyer said the biggest concern was safety. “Even the smallest misalignment can have disastrous effects. There are different methods available but the one we use is unique and easy to use. It is compact and wireless and can perform a complete geometrical survey of the line axis, track adjustment, documentation and approval.” The technology was also used to check alignment for tracks used for high speed trains where a slight change in alignment could have huge consequences, he added. It was used for track alignment at Bengaluru and Hyderabad metro rail systems.

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