It is often a nuisance for residents living near railroad lines—and such a multi-faceted challenge for experts that there should be more than one word for “railroad noise.” Sounds from steel wheels on rough or smoother rails, braking sounds at different frequencies, engine noise, aerodynamic noise …all of it muffled or influenced by noise barriers, embankments, the nature of the ground beneath the tracks, and by the environment in which the sound waves propagate.It is often a nuisance for residents living near railroad lines—and such a multi-faceted challenge for experts that there should be more than one word for “railroad noise.” Sounds from steel wheels on rough or smoother rails, braking sounds at different frequencies, engine noise, aerodynamic noise …all of it muffled or influenced by noise barriers, embankments, the nature of the ground beneath the tracks, and by the environment in which the sound waves propagate.[#item_full_content]