Serious incidents or other major events such as derailments, crashes, fires, weather, terrorist, etc (to give a few examples - this list is not exhaustive) can also prove to be a particularly difficult subject, especially in the early stages. These type of events will always lead to speculation and internal investigations. As a result the following applies on this forum: (7.3a) Forum staff members will confirm the facts when they have them to hand, though it may be some time time before this is possible. (7.3b) LU staff that are directly involved in an incident may post a brief outline if they feel it is appropriate - however as with our one under rule above, details of a fatal incident are not allowed in case of any prejudice at a future inquest. (7.3c) Discussion will be at the discretion of the forum staff, however in most cases once the facts have been confirmed, a given thread will most likely be locked to prevent non-factual speculation. (7.3d) Should an official report be released, a request can be made to a member of forum staff to have a link added to the original locked thread. For further discussion after an official report has been released, a new thread should be started.
Given that this type of incident/event will be subject to official lines of enquiry and/or investigation, it is important that we do not allow this forum to become involved with speculation that would detract from the facts. Information may or may not be found within websites elsewhere on the internet - just because it's on another website, it doesn't mean it is factually correct or that we can or will allow it here; again the forum staff cannot 'police' other websites, but we are responsible for what appears on this forum.
Given that this is a very serious near miss which, in slightly different circumstances, could have resulted in a serious collision it is highly likely that RAIB will be investigating. As such, in accordance with forum rules this thread will remain locked. The forum staff will update it as and when press releases are made and/or formal reports published.
At around 21:45 hrs on 21 June 2020, a Chiltern Railways passenger train travelling southbound on the Metropolitan line of the London Underground network, passed a signal at danger (red) without authority. The signal was protecting a junction through which a route was already set for a northbound train, waiting in Chalfont & Latimer station, to cross in front of the southbound train. Passing the signal at red resulted in an automatic brake application which stopped the southbound train around 310 metres beyond the signal. Shortly afterwards, the train driver reset the automatic brake equipment and the train continued towards Chalfont & Latimer station, around 620 metres away. As a result of the position of the points at the junction, its route towards the station took it onto the northbound line. The northbound London Underground train on this line was stationary because the signal in front of it had changed to red as a result of the southbound train passing the red signal. The two trains stopped about 23 metres apart.
There were no reported injuries but some track components were damaged as the southbound train had proceeded through a route that was not set for it.
Our investigation will identify the sequence of events which led to the signal being passed at danger and the subsequent near-miss. It will also consider
- the actions of the people involved - Chiltern Railways’ arrangements regarding the training, competence and fitness of its train drivers - Chiltern Railways’ management of risk associated with its drivers operating on the London Underground network how risk associated with signals passed at danger by non-London Underground trains is managed on the London Underground network any relevant underlying factors
Forward-facing CCTV image from southbound train, showing stopping positions of the trains involved (image courtesy of Chiltern Railways)
Last Edit: Jul 7, 2020 10:20:12 GMT by rincew1nd: Image and caption added