The Relationship Between The Noise of Moving Trains And The Steel Rails

Since the beginning of the 20th century, when our high-speed trains started to operate in 2005, our country has said goodbye to the slow green trains and slow trains. Those loud noises because of the steel rails, made the train rides exhausting. Nowadays, high-speed trains are substantially more comfortable to ride, not only quiet and comfortable, but also well insulated and warm in winter and cool in summer.

Sources of noise

The main cause of noise during train travel is the laying of the steel rails. The two rails underneath the train wheels determine the departure and destination of the train, which not only has a bearing role but also a guiding role. Older tracks connect 12.5 or 25 metres of rail with cleats and bolts, with a cleat device - a rail joint - existing every 25 metres. Due to the consideration of thermal expansion and contraction, a further 1 cm gap is left between each rail when it is laid, this gap is known as the rail gap. This insignificant gap not only makes the train clunk when it is running, but also limits the speed of the train and can easily cause great wear and tear to the rail joints and wheels.

High-speed rail track

Nowadays, high-speed rail is noiseless, mainly because we use a special type of steel and have taken into account thermal expansion and contraction. The rails are expanded in advance at high temperatures in the workshop and then locked onto fixed concrete sleepers after cooling, which are screwed together with strong railway fasteners to hold the rails together. In short, the steel of the rails that have been expanded, they are then subjected to weather changes and the thermal expansion and contraction is almost imperceptible.

Now high-tech mechanical means has been developed very advanced, laying high-speed rail track, the length of each one, can be processed up to 1 km or 2 km long, using the welding method for processing connection laying, welding including matching rail, straightening, flaw detection and other processes, after strict quality inspection before being able to off the line, each rail strength, toughness, and load-bearing index will be repeatedly tested.

The welded long rails are temporarily stored at the storage platform and then transported to the laying site on special goods trains. The rail is then transported to the laying site on special freight trains. The rail is welded together in sections by means of special installation vehicles, thus eliminating the rail joints. This is what we call a seamless line. The gaps are so small that they are basically invisible in millimetres.

The rails directly determine the safety of the operation of high-speed rail, in order to avoid safety problems and hidden dangers, to avoid the occurrence of safety accidents, the laying of high-speed rail track and the replacement of the track work, are not just able to work.

How is it maintained

We have described above the track of the high-speed rail, whether construction laying or maintenance and replacement, must be strictly in accordance with the temperature of the track on the day of operation, only strict reference to the premise of the temperature, to ensure that the resistance of the track bed of the high-speed rail track to maintain stability. And it is only within the reserved expansion zone that the track can be replaced.

And all lines of the high speed rail are divided into areas of regular maintenance and inspection, once problems and and hidden dangers are found to arise, the relevant maintenance personnel of the railway department will be the first to overhaul and repair, which can guarantee the high quality passage of any section of the high speed rail.

No matter how high the processing technology, all need to late strict maintenance and the implementation of the system in place, in order to have the high-speed development of China's high-speed rail and safe and smooth operation.

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