Editing Cambrian Line (section)

== Accidents and incidents ==
===Abermule 1921===
{{main|Abermule train collision}}
The worst accident on the Cambrian Line – and the worst on the former Cambrian Railways system – occurred on 26 January 1921 on the single-tracked line between {{stnlnk|Abermule}} and {{stnlnk|Newtown|Wales}}. A westbound stopping train from {{stnlnk|Whitchurch|Shropshire}} set off from Abermule without the correct authority, and collided head-on with an eastbound express from {{stnlnk|Aberystwyth}}. Seventeen people were killed, including the driver and fireman of the stopping train.

===2009 level crossing incident===
On 2 September 2009, a Class 97/3 locomotive, operated by Network Rail, collided with a Fiat Punto on an unmanned level crossing near Penrhyndeudraeth. The driver of the car, an 83-year-old local resident, was killed in the collision. Prior to her death, the victim had been a regular user of the level crossing for more than 40 years, and relied on her knowledge of passenger train timetables to determine when it was safe to cross. On the day of the collision, she had not used the telephone prior to crossing.<ref>{{cite web |date=16 June 2010 |title=Track lights urged after Gwynedd woman's death |url=https://www.bbc.com/news/10327865.amp}}</ref>

===Llanbadarn level-crossing incident===
Shortly before 22:00 on Sunday 19 June 2011, a passenger train from {{rws|Aberystwyth}} to {{rws|Machynlleth}} ran onto the level crossing at Llanbadarn while the barriers at the crossing were raised, and came to a stop with the front of the train about {{Convert|31|m}} beyond the crossing. There were no road vehicles or pedestrians on the crossing at the time.<ref name=raibllanbadarn>{{cite report |author=Rail Accident Investigation Branch |url=https://assets.publishing.service.gov.uk/media/547c8fdded915d4c0d000171/R112012_120627_Llanbadarn.pdf |page=5 |title=Incident at Llanbadarn Automatic Barrier Crossing (Locally Monitored), near Aberystwyth, 19 June 2011 |publisher=[[Rail Accident Investigation Branch]] |date=June 2012 |access-date=12 December 2012 |issue=11/2012 }}</ref> The immediate cause of the incident was that the train driver did not notice that the indicator close to the crossing was flashing red until it was too late for him to stop the train before it reached the crossing. Factors behind this included the driver's "workload" (his need to observe a screen in the cab at the same time as he should also be observing a lineside indicator), the design of the equipment associated with the operation of the level crossing, and the re-setting of the signalling system on board the train before it could depart from Aberystwyth. An underlying cause of the incident was that the signalling system now in use on the lines from Shrewsbury to Aberystwyth and Pwllheli did not interface with the automatic level crossings on these routes.<ref name=raibllanbadarn/>

The [[RAIB]] made six recommendations: three directed to Network Rail, two to Arriva Trains Wales and one to the [[Rail Safety and Standards Board]] (RSSB). These cover the development of engineering solutions to mitigate the risk of trains passing over automatic crossings which have not operated correctly; changes to the operating equipment of [[Llanbadarn Fawr, Ceredigion|Llanbadarn]] crossing; the processes used by railway operators to request permission to deviate from published standards; the operational requirements of drivers as trains depart from Aberystwyth; and the way in which drivers interact with the information screens of the cab signalling used on the Cambrian lines. The failure at ERTMS System-User Interface investigated by the RAIB indicates that the ERTMS Implementation did not satisfy the  non-functional attribute of safety integrity of the real time [[Dependability|dependable]] distributed computing concepts.<ref name=raibllanbadarn/>

===2024 Talerddig Incident===
{{main|2024 Talerddig train collision}}
At 19:30 on 21 October 2024, the Shrewsbury to Aberystwyth service and the Machynlleth to Shrewsbury services collided outside of the village of Llanbrynmair, Powys.<ref>{{Cite web |date=2024-10-21 |title=Train crash Wales: Man dies, 15 in hospital, after collision |url=https://www.bbc.co.uk/news/articles/c5y0yg7m8meo |access-date=2024-10-22 |website=BBC News |language=en-GB}}</ref> The incident resulted in one death and fifteen injuries. Initial inspections by the [[Rail Accident Investigation Branch|RAIB]] found evidence of low [[Slippery rail|rail head adhesion]].<ref>{{Cite web |title=Collision of two passenger trains at Talerddig, Powys, Wales |url=https://www.gov.uk/government/news/collision-of-two-passenger-trains-at-talerddig-powys-wales |access-date=2024-10-23 |website=GOV.UK |language=en}}</ref>