Warum ist es gefährlich selbständig im Notfall im Tunnel aus den Zug auszusteigen?
Vor zwei Wochen ist eine S Bahn in Mainz im Tunnel stecken geblieben und es hat 2,5h trotz Hitze gedauert bis es evakuiert wurde.
Ich habe nun etwas die Diskussionen darüber gelesen und manche haben geschrieben sie würden in so einer Situation selbstständig aussteigen, andere haben aber gesagt das sei lebensgefährlich da der Zug nicht geerdet ist oder so und man beim aussteigen direkt geröstet werden kann. Kann mir das jemand erklären? Kann man da einen Stromschlag bekommen? Dass das generell keine gute Idee ist und auch andere Züge an den Gleisen kommen können möchte ich hier mal nach verlässigen, mich interessiert nur der Stromaspekt. Was ist denn der Stromtechnische Unterschied ob ich an der Haltestelle aussteige und wenn ich im Tunnel aussteige?
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Apart from S-Bahn Berlin and S-Bahn Hamburg, I do not know any S-Bahn that works with busbars near the ground. But maybe give more. I don’t know if the S-Bahn Mainz has any. If you look at pictures of the event, you can see the tunnel with only overhead. Here an outgoing from an electrical perspective would theoretically be harmless. The rails have ground potential and as long as there is no defect on the rails, there can be no current impact. In the case of busbars instead of overhead line, that would be different.
What is even more dangerous in the tunnel is the other pressure/actual effects when trains pass through… And there is hardly any space in the tunnel to “evade”… It is therefore not permissible to evacuate without a roadblock. Rescue measures may also be carried out as far as I know only if the supply is switched off and grounded for safety reasons. The over 2h are also hard at discusion because it would have been much faster and technically possible… Here some have probably “penned”…but this is just trying to explain when you read the reports.
I don’t know: Probably because you’re in Germany:
Train stays stuck in the Weissenstein Tunnel – SWI swissinfo.ch
Looks like this in the tunnel:
https://flic.kr/s/aHskKa65ws
In such a situation, I would have gone to the locomotive and asked him to open the doors as it is extremely hot or I would have chosen the emergency call earlier.
I don’t see any risk on S-Bahn with overhead line feed. In railways with busbars on the ground, you should know how the busbars in the tunnel are protected from contact in order to clarify your question. The protective covers over the busbars are usually seen at the platforms. Even they do not offer complete protection:
A few years ago, a passenger came to death at the platform of a Berlin subway through a power strike without noticeable irregular behavior: Besides him, a disabled person lost his metal crutch. It slipped between subway and platform edge. The passenger tried to raise the crutch. The crutch under the rail cover came into contact with the busbar. That was deadly.
Possibly, in the tunnel, the contact protection on the busbar is designed to be somewhat less expensive, which means that the risk of accident would be somewhat greater.
That this is dangerous to life, “because the train is not grounded”, is of course nonsense. The train is always grounded over the track.
In the case of S- and subways, the travel current is often not supplied via an overhead line, but rather a bus bar. This busbar runs next to the track. At the platform you can’t touch them, when you get off on a free track. Such contact should cause immediate death
Approximately Except Sog Effect