Noise tests will be conducted on a section of the skytrain after complaints about noise prompted the train operator to take steps to correct rail track faults, a source said.
The tests to gauge the noise level -- to be carried out on a curve between Bang Na and Udom Suk stations where excessive noise was heard being made by trains in motion -- are planned for next month and January.
The noise prompted locals in the area to complain to the authorities. Further details were not available.
The tests will be conducted now that the BTSC, operator of the BTS Skytrain, has corrected faulty tracks along the curve, which were believed to have generated the noise.
The source said the Department of Rail Transport (DRT) asked the BTSC to ensure the surfaces of the tracks were smooth to provide a quick and cost-saving solution to the problem.
The BTSC went ahead with the work between Nov 16-22 and residents have said less noise was being made, according to the source.
However, noise tests will need to be performed to serve as scientific confirmation that the noise pollution has been tackled.
Officials from the DRT and the BTSC will join university experts in conducting the tests using sound level meters.
The Bang Na to Udom Suk stations are part of the Sukhumvit or Light Green Line operated by the BTSC and were opened in 2011 as part of a the Skytrain extension from On Nut station to Bearing.
Before the work on the track was performed, the DRT said it had studied the guidelines to reduce train noise based on International Union of Railways studies such as "Railway Noise in Europe" (2016) and "Noise Reduction in Rail Freight" (2007).
It found that train noise could be reduced with smoothing tracks, rail pad stiffness enforcement, changing a train's brakes or erecting noise walls.