What is it called when a train goes off the rails?
A train derailment happens when a train comes off its rails. Train tracks are designed to have two steel rails at a fixed distance apart. These rails are responsible for keeping the train wheels moving along the course of the tracks.
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In a major train derailment, the train will often come off the tracks completely. Depending on where the derailment occurs, its momentum may cause it to collide into compartments ahead of the compartment that became derailed. If any passengers are onboard, this can result in serious injuries.
Both portable and permanent derails are tools that attach to the track, causing the train to slowly derail as it rolls over them. These safety measures are used in situations where it would be more dangerous to allow the locomotive to forge ahead, such as instances where a person or animal is blocking the track.
While fatalities from train derailments are rare, derailments themselves are actually quite common. From 1990, the first year the BTS began tracking derailments and injuries on a yearly basis, to 2022, there have been 55,741 accidents in which a train derailed. That's an average of 1,689 derailments per year.
When a train hits a car or truck at a crossing, the train always “wins”. It is much, much larger and heavier than any truck. However, it is possible that a collision at a “grade crossing” (where a road crosses a track at track level, not an overpass or underpass) can cause a locomotive to derail.
Compartment and cabin would both work. The difference between the two words is that a cabin is meant for people, while a compartment could be for people, or for other things like baggage.
In rail transport, a derailment occurs when a rail vehicle such as a train comes off its rails. Although many derailments are minor, all result in temporary disruption of the proper operation of the railway system and they are a potentially serious hazard.
Slippery rail, or low railhead adhesion, is a condition of railways (railroads) where contamination of the railhead reduces the traction between the wheel and the rail. This can lead to wheelslip when the train is taking power, and wheelslide when the train is braking.
A derailment of a train can be caused by a collision with another object, an operational error (such as excessive speed through a curve), the mechanical failure of tracks (such as broken rails), or the mechanical failure of the wheels, among other causes.
Train derailments are quite common in the U.S. The Department of Transportations' Federal Railroad Administration has reported an average of 1,475 train derailments per year between 2005-2021. Despite the relatively high number of derailments, they rarely lead to disaster.
According to Gattie and the FRA, “a derailment happens when on-track equipment leaves the rail for a reason other than a collision, explosion, highway-rail grade crossing impact, etc.” Gattie also said that most derailments happen inside the rail yards and are caused by faulty tracks or basic human error.
Federal data from 2021 and 2022 says an average of about three trains derail in the U.S. a day. While not all derailments are equally as dramatic or dangerous, railroads are required to report any derailment that causes more than $10,700 in damage.