Editing Wrong-side failure (section)

== Accidents ==
While accidents from the problem are rare, they do occur:
* 1876 – [[Abbots Ripton rail accident|Abbots Ripton rail disaster]] (England) – signals frozen by [[blizzard]] in 'clear' position (signal arm hidden in a slot in the post).
* 1915 – Rockledge, Tennessee – Relocation of a Western Union telegraph line from old alignment to new alignment causes a false clear signal indication when the Western Union wire comes in contact with the signal wire for the automatic block signal at the south end of the siding at Rockledge. A southbound freight train departed Rockledge on the false clear indication and collided with a northbound passenger train that had entered the block at Tantallon on a proper clear indication two minutes before the freight train departed Rockledge. A contributing factor was that the tower operator at Rockledge only controlled the signals, the track switches being operated by the train crews themselves.
* 1927 – Marrar (NSW, Australia) – lightning damage meant that the single line [[Tyer's Electric Train Tablet|train tablet]] system incorrectly released two tablets simultaneously putting two trains on a collision course; fortunately they saw each other and were able to stop in time.<ref>{{cite news |url=http://nla.gov.au/nla.news-article16429440 |title=Railway Safety |newspaper=[[The Sydney Morning Herald]] |issue=28073 |location=New South Wales, Australia |date=27 December 1927 |accessdate=4 January 2018 |page=7 |via=National Library of Australia}} </ref>
* 1938 – [[Charing Cross (Northern line) tube crash]] (London) – signal linesman rewires a faulty signal incorrectly, so that it shows green too soon; two [[London Underground|Underground]] trains collide as a result, injuring twelve. Also [[Charing Cross (District line) tube crash]], signal linesman makes wiring error in cabin, two [[London Underground|Underground]] trains collide, killing six.
* 1953 – [[Sydenham Rail Disaster]] (NSW, Australia) – five killed
* 1976 – Glenbrook, New South Wales (Australia) Automatic signal in rear of a stationary [[Electric multiple unit|EMU]] at "caution" when it should have been at "danger". Following goods train enters occupied signal section and collides with EMU; 1 passenger killed. Cause attributable to deteriorated wiring which allowed a false feed.
* 1979 – [[Invergowrie rail crash]] (Scotland) – signal was at "wrong" (i.e. indistinct indication) yet taken by driver to be a 'proceed' signal.
* 1982 – [[Valley Heights train collision]] (NSW, Australia) – electrician wrongly replace out clear glass lenses with coloured glass causing false colour with reflected sunlight.<ref>{{cite web |url=https://www.youtube.com/watch?v=J-HrOJ3xwzs  |archive-url=https://ghostarchive.org/varchive/youtube/20211212/J-HrOJ3xwzs| archive-date=2021-12-12 |url-status=live|title=StateRail - Early 1980s Valley Heights Train crash |author=Doctornickau |date=9 November 2008 |website=YouTube |accessdate=4 January 2018}}{{cbignore}}</ref>
* 1988 – [[Clapham Junction rail crash]] (London) – single stray wire causes false green signal and collision killing 35.
* 1990 – [[Cowan rail disaster]] (NSW, Australia), which occurred when sand on the rails insulated the wheels from the rails, causing a failure to shunt that allowed a trailing block signal to improperly display a clear aspect, resulting in a rear-end collision.
* 2005 – [[Deelfontein]] (South Africa) – [[solder]] splatter bridges a [[relay]] contact.  Most testing is done with the relays unplugged which would not detect the splatter, while the solder splatter is likely to lead to a difficult to trace phantom problem.
* 2009 – On March 26, two trains collided near Arévalo, Spain while engineers were testing a new signalling system. Lack of safeguards and testing on an active line led to the collision of two freight trains. One of the train drivers died.<ref>{{cite web |url=http://www.fomento.gob.es/NR/rdonlyres/95CF9A6B-F932-4E31-90E6-E4A6DE50772C/100149/IF260310_281210CIAF.pdf |title=Informe Final Sobre el Accidente Ferroviario No 0018/2010 Ocurrido el Día 26.03.2010 en las Proximidades de la Estación de Arévalo (Ávila) |trans-title=Final Report on Railway Accident No. 0018/2010 occurring on 26 March 2010 near Arévalo Station (Ávila) |website=[[Ministerio de Fomento]] |language=es |accessdate=4 January 2018}}</ref>
* 2009 – [[June 22, 2009 Washington Metro train collision|Ft Totten crash]] [[Washington Metro|Washington DC Metro]] (WMATA). An inbound Red Line train stopped short of Ft. Totten station; the following train failed to stop and impacted at about {{cvt|42|mph}}. Nine dead, 80 injured. Preliminary NTSB reports were that the AC track circuit transmitter was breaking into parasitic oscillation, and that coupled across the rack cabinet to the receiver.
* 2020 – On the Italian high speed rail network,  maintenance workers during the night left a  faulty point to the reverse position, but disconnected its network connection and its link to the safety signalling system ([[ETCS]] L2); the first morning high speed train received a green signal to proceed at full speed and hit the point at {{cvt|181|mph}}, resulting in the [[Livraga derailment]] which killed 2 and injured 31.
* 2024 - [[2024 Cicalengka railway collision]]. An uncommanded signal displaying a false clear aspect due to aging hardware causes two trains to collide near [[Cicalengka Station]] in [[Bandung Regency]], Indonesia, killing four rail employees and injuring 42 others.<ref>{{Cite web|url=https://apnews.com/article/indonesia-train-collision-java-b9357f6ef81dd15695ba43fa5f7bb47d |title=Trains collide on Indonesia's main island of Java, killing at least 4 people |work=Associated Press |date=5 January 2024}}</ref><ref>{{Cite web|url=https://www.antaranews.com/berita/3901029/empat-orang-meninggal-akibat-kecelakaan-kereta-api-di-bandung |title=Empat orang meninggal akibat kecelakaan kereta api di Bandung |work=Antara |date=5 January 2024}}</ref>