Editing Wrong-side failure (section)

{{short description |Dangerous failure of railway signalling equipment}}
{{refimprove|date=July 2010}}
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.)