Wrong-side Failure
A wrong side failure describes a failure condition in a piece of railway signalling equipment that results in an unsafe state. A typical example would be a signal showing a 'proceed' aspect (e.g. green) when it should be showing a 'stop' or 'danger' aspect, resulting in a "false clear". (The converse is a right side failure, where even with any reduction the resulting state is safe overall.)
Read more about Wrong-side Failure: Example of How A Wrong Side Failure May Occur, Accidents, False Alarms, Wrong-side Failures To Be Reported
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