Well they were told what they should of done by a member of railway staff, just some decided they knew better, ignored the driver and walked unattended up the line. Said it before, what if the power was off and a train ran into the people or if someone stepped on the rail - those same passengers will blame Network Rail. And to "get away from danger", they would have had to walk past the fire (was at the front of the train) - that could of easily gone bang. If you are going to evacuate, then do what the other passengers done, move away from the fire and wait for the emergency services.
This keeps happening in the London area, i think all trains need to be fitted with sheepdogs to round up all these people who think they they know better than rail staff.
I think this is hugely unfair. Your attitude is somewhat typical of rail experts who frequent this forum - I had watched, as had fellow southeastern commuters, the anger that was directed towards passengers when they disembarked a 100 degree carriage in Bexleyheath last year after having had two hours with minimal/no communication but alas that was/is a different incident.
Is it not a concern that those with "traction knowledge" make the automatic assumption that people can be left on the train, indefinitely, because it is the safest place for them and thus they can be trusted to stay in situ until such a time that they see fit. It strikes me as a quite worrying symptom of a poor relationship between the rail industry and its customers.
There are some inaccuracies floating around on this thread which require some correction before judgement is passed.
On southeastern trains, there are safety notices advising passengers that they are safer to remain on the train. It makes no reference to fire and faced with a thick plume of smoke one is likely to attempt to get away from it. In reference to another recent post, I do not think a wheelchair would fit between the gangway on a 465 (that is of course, if it could be easily opened without power) and presumably when a carriage load of passengers pass down the train, the toxic smoke would follow?
Furthermore, there is some condemnation that passengers ignored a member of train crew. One makes the presumption that all passengers heard the announcement made by the driver - but the evidence is that some people did not hear an announcement whilst others did - suggesting that one was made. However people may not have heard it for a variety of reasons, such as fellow passengers talking over it or from my own experiences, I would suggest that the PA system was faulty. Announcements on southeastern trains are frequently inaudible and if one can indeed tell that one is being made, they cannot be made sense of so perhaps one should not rely on passengers hearing any advice given by the driver.
Secondly, you criticise passengers for wandering 'past the fire.' I believe that the fire was out by the time that passengers had proceeded past the cab of the train. It also clearly states that passengers had gone to check on the wellbeing of the driver to see if he had managed to escape the smoke himself. As a matter of opinion, this is a brave and applaudable action rather than one for unwarranted criticism and rather contradicts the 'every man for himself' attitude that some seem to pin upon commuters.
It is likely that upon proceeding towards the cab to check on the driver's wellbeing that passengers noticed that there was no immediate threat of fire, juxtaposed to the immediate threat of ill-health from the smoke filled front carriages thus rendering being off the train and perhaps putting some distance away from the source of ignition as being the safest option in the eyes of the commuters.
I will not accept that passengers acted in anything other than a rational way.