derailment

[ dee-reyl-muh nt ]

/ diˈreɪl mənt /

the act or process of derailing.

Psychiatry. loosening of associations.

Origin of derailment

1940–45; derail + -ment, or < French déraillement

In contrast, the derailment of talks would be welcomed by some of the loudest proponents of rushing to legislate new sanctions.

Why Now is Not the Time for New Sanctions on Iran |Dylan Williams |November 5, 2013 |DAILY BEAST
Security-camera footage capturing the derailment, which can be viewed here is pretty horrifying.

Men’s Terminal Velocity: Why the Deadly Need for Speed? |William O’Connor |July 27, 2013 |DAILY BEAST
This prevents wear and tear and grinding and derailment on curves.

The Invention of the Track Circuit |American Railway Association
It was surging and bounding alarmingly over the uneven track, not without threatenings of derailment.

Empire Builders |Francis Lynde

In case of derailment or other accident that might cause the fireman to desert his position in cab, what should he do?

The Traveling Engineers' Association |Anonymous
It is better to take a chance on a derailment than on a collision.

Letters from an Old Railway Official |Charles DeLano Hine
They had been walking on down the line, looking for the actual point of derailment.

The Taming of Red Butte Western |Francis Lynde