Chennai Metro is working to minimise noise during metro train riding

Due to friction produced by train movements and exposure to the environment, the ballastless rails experience corrugation and, in some cases, corrosion

Chennai Metro
Image Source: CMRL

CHENNAI (Metro Rail News): Many commuters may have experienced a screeching noise in metro trains, generated mainly by train-track friction, which frequently occurs on tight curves. The Chennai Metro Rail Limited (CMRL) will shortly commence track maintenance, including the use of rail grinding equipment to smooth out rails worn down by train operations, minimise noise, and increase the life of the rails.

According to a metro rail official, work would be completed in 90 days over the 54-kilometre line from Wimco Nagar to Airport and from Central Metro to St Thomas Mount. “We’ll probably start working in February.” According to the official, the work will be done between midnight and 4.30 a.m.

“The grinding will improve rail-wheel interaction in addition to lowering noise,” the official stated. According to officials, the rail grinding machine, which resembles a diesel locomotive, is expected to be rented from the Bangaluru metro and operated by a foreign specialist. CMRL has issued a tender for the machine’s transportation, loading, and unloading.

Due to friction produced by train movements and exposure to the environment, the ballastless rails experience corrugation and in some cases, corrosion. This frequently results in rail squeals, a screeching noise made by trains as they navigate sharp curves or straight stretches, as well as shocks and vibrations.

As a result, the rails must be ground regularly. Rail grinding began shortly after its establishment in 2015, and it will continue in 2019, 2020, and 2021. “The primary concern that occurs from failing to grind the rails is the harm that the undulation and pit marks on the train wheels may cause.”

“The rails are constructed of hard steel, while the train wheels are made of soft steel, both of which are imported from Europe and are costly to replace if they are broken,” one official explained. With the 118.9 km phase-2 taking shape, CMRL officials said a procurement process for rail grinding equipment has begun, which might cost roughly Rs 50 crore and take nearly 2.5 years to complete.

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  1. I hate to be the one to say this, but rail corrugation does not usually cause curve squeal, although it does cause rail noise (roaring), so do not expect curve squeal to be fixed by the rail grinding.


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