Why Do Trains Make so Much Noise

Why Do Trains Make so Much Noise

Bad joint track train rail
Sometimes called railway fishplates, rail joints are an important component of a rail track system to connect two rail tracks together. Three commonly used types of rail joints include:
Bolted joints,
Compromise joints,
Insulated joints,
As a rail joint, the bolted joints are usually used to join rail tracks together before the are welded. As to joining two rails with differing sections, the compromise joints are mostly used. And the insulated joints are always used as the bonded or non-bonded joints.

Although the perform of these three types of rail joints is different, they still have many similar features:

Bolts and bars are all used and a discontinuity is created on the running surface of the rail track
The discontinuity can accelerate track degradation around the rail joints while trains are running
Today the worldwide famous insulated rail joints are bonded insulated rail joints and polyurethane insulated rail joints.
Bonded insulated rail joints are mostly used to separate electric circuits in rails and turnouts. Because of widely used in continuously welded rails (CWR), the bonded insulated joints in rails must be ensured to transfer longitudinal forces arising in the railtracks. And insulated joints can also cut in square or angular.

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Trains actually don't make that sound. The rails make it. A rail is not a single metal piece but a series of rail pieces with certain length. ... The sound is generated because of the lateral movement of the wheels and subsequent connection/friction with the tracks.
Train noise is vehicle noise created by trains. Noises may be heard inside the train and outside. Various parts of a train produce noise, and different kinds of train wheels produce different amounts of noise. Noise barriers can attenuate the noise.

Subways, Light Rail transit and freight trains can send loud train noise into neighborhoods. Organizations such as the World Health Organization and the U.S. Environmental Protection Agency have set guidelines for noise level decibel limits for Rapid Transit

Train noise can be a type of environmental noise. When a train is moving, there are several distinct sounds such as the locomotive engine noise and the wheels turning on the railroad track. The air displacement of a train or subway car in a tunnel can create different whooshing sounds.
Trains also employ horns, whistles, bells, and other noisemaking devices for both communication and warning.
Trains propelled by electric traction motors often produce electromagnetically-excited noise. This high pitch noise depends on the speed and torque level of the machine, as well as on the motor type. Variable frequency drives use Pulse-width modulation technique which introduces additional current harmonics, resulting in higher acoustic noise. The switching frequency of the PWM can be asynchronous (independent of the speed), synchronous (proportional to the speed), but always results in acoustic noise varying with speed.
Flange Squeal is the sound of the flanges of the metal train wheelset turning on the train track.
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