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Rail roughness and corrugation are treated by grinding the rails. This reduces noise in problem areas although trains make a distinctive tonal sound on freshly-ground track due to the pattern on the rail left by the grinding process, which wears flat over time. Rail squeal is a sound caused by a train's wheels slipping under specific conditions ...
Noise regulation includes statutes or guidelines relating to sound transmission established by national, state or provincial and municipal levels of government. After the watershed passage of the United States Noise Control Act of 1972, [2] other local and state governments passed further regulations.
The correlation of these measurements indicates how much track-born noise is propagating through the ballast into the bedrock strata. This correlates directly with the noise levels experienced by surrounding area. Ground based noise systems are commonly installed near or inside tunnels.
For all new or replacement train horns on trains capable of travelling up to 100 mph (160 km/h) a much lower minimum sound pressure level has been established – and a maximum sound level has been introduced (min 101 dB and max 106 dB). British train horns have two tones, high or low, and in some cases, a loud or soft setting.
A torpedo on a rail A detonator on a railway line in Belgium South African example. Typical uses of detonators include: A warning, caution or stop signal in dense fog, when signals are difficult to see; A warning of a train stopped on the line ahead by an incident or accident—the train crew are usually responsible for placing the detonators
Within the United States, each railroad operator formulates its own operating practices, subject to the regulations in Title 49 Part 236 of the Code of Federal Regulations). However, there are two major groups of railroads that have adopted common operating practices and therefore a common operating rule book.
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The Interstate Commerce Commission (ICC) was a regulatory agency in the United States created by the Interstate Commerce Act of 1887.The agency's original purpose was to regulate railroads (and later trucking) to ensure fair rates, to eliminate rate discrimination, and to regulate other aspects of common carriers, including interstate bus lines and telephone companies.