• Train noise can be a type of environmental noise. When a train is moving, there are several distinct sounds such as the locomotive
  Locomotive
  A locomotive is a railway vehicle that provides the motive power for a train. The word originates from the Latin loco – "from a place", ablative of locus, "place" + Medieval Latin motivus, "causing motion", and is a shortened form of the term locomotive engine, first used in the early 19th...
  
   engine noise and the wheels turning on the railroad track
  Rail tracks
  The track on a railway or railroad, also known as the permanent way, is the structure consisting of the rails, fasteners, sleepers and ballast , plus the underlying subgrade...
  
  . The air displacement of a train or subway
  Rapid transit
  A rapid transit, underground, subway, elevated railway, metro or metropolitan railway system is an electric passenger railway in an urban area with a high capacity and frequency, and grade separation from other traffic. Rapid transit systems are typically located either in underground tunnels or on...
  
   car in a tunnel can create different whooshing sounds.
• Trains also employ horns
  Train horn
  Train horns are audible warning devices found on most diesel and electric locomotives. Their primary purpose is to alert persons and animals to the presence of a train, especially when approaching a grade crossing. They are also used for acknowledging signals given by railroad employees Train horns...
  
  , whistle
  Steam whistle
  A steam whistle is a device used to produce sound with the aid of live steam, which acts as a vibrating system .- Operation :...
  
  s, bell
  Bell (instrument)
  A bell is a simple sound-making device. The bell is a percussion instrument and an idiophone. Its form is usually a hollow, cup-shaped object, which resonates upon being struck...
  
  s, and other noisemaking devices for both communication and warning.

See also

• Noise barrier
  Noise barrier
  A noise barrier is an exterior structure designed to protect sensitive land uses from noise pollution...
  
  
• Noise health effects
  Noise health effects
  Noise health effects are the health consequences of elevated sound levels. Elevated workplace or other noise can cause hearing impairment, hypertension, ischemic heart disease, annoyance and sleep disturbance. Changes in the immune system and birth defects have been attributed to noise exposure...
  
  
• Noise regulation
  Noise regulation
  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, other local and state governments passed further regulations...