Why are freight trains so noisy?

Freight trains generate noise. This has to do with the fact that freight wagons - in contrast to passenger carriages - are equipped with metallic cast iron brakes. During braking, the running surface of the wheels roughen. This leads to an unpleasant rolling noise being created by the wheel in contact with the rail.



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In one study conducted at the BNSF Railway Hobart Railyard in Los Angeles, the California Environmental Protection Agency estimated that residents living near a railyard experienced a higher risk of carcinogen exposure.

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At night, the air near the ground can have a different temperature than air only a few hundred feet above1. This affects the transmission of sound waves. There is usually less ambient noise after dark, so the distant train sounds louder.

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The reason that trains honk their horns so much at night is because it's dark and the trains aren't so easy to see. Even though the lights are on, we sometimes can't see them coming, especially around the many blind curves near or ahead of the train station.

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Freight and Commuter Trains Don't stop on the tracks. Make sure you have room to get across. Once you enter the crossing, keep moving. Stop 15 feet away from flashing red lights, lowered gates, a signaling flagman or a stop sign.

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It's illegal to walk on the tracks unless you're at a designated crossing. It's extremely dangerous to walk, run, or drive down the railroad tracks or even alongside them. Trains travel in both directions and at all times of day and night. You never know when a train might be heading your way.

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The giant two-stroke, turbocharged engine and electrical generator provide the huge amount of power needed to pull heavy loads at high speeds. Cummins' locomotive engine weighs over 24,000 pounds (10,886 kilograms). The generator and electric motors add more mass on top of that.

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European trains hardly ever use their horns and have no bells. I suspect it is due to different fencing and level crossing design practices. In most of Europe, railway lines are continually fenced and most level crossings have gates or barriers.

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What happens if you stand too close to a train? Air between person and the train moves with high velocity due to dragging effect and the air behind person is approximately still.

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Electricity is easily the most dangerous factor in stepping on the track – it's always switched on and nine out of ten people die when they're struck by it. You can't outrun a train. And even if you could, you wouldn't hear it coming, as today's trains almost silently reach speeds of 125mph.

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What can stop a train in real life? The most common way is to use the brakes. The brakes are located on each wheel of the train and are applied by the train engineer. The engineer can apply the brakes manually or automatically.

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As the train moves along thetrack, the result is an oscillating force at each wheel/track contact, and this is transmitted to the ground at each sleeper/ground contact. It's this force that shakes the ground.

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Under the Train Horn Rule (49 CFR Part 222, issued on August 17, 2006), locomotive engineers must begin to sound train horns at least 15 seconds, and no more than 20 seconds, in advance of all public grade crossings.

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The intensity of sound (such as a train horn) that you hear will vary at night, sometimes louder and sometimes softer. The explanation is the height of the inversion above the ground.

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