I daresay the vast majority of train passengers are going to understand what a railway is, and how to summon assistance for anyone on the train injured in an accident. By dialing 999, probably.
But this doesn't really answer the question as to why a safety trained second crewperson should be required on a train, but not on a bus.
And as is discussed every time a bridge bash thread comes up , dialing 999 which puts you through to a generic region/force wide control room for the emergency service you ask for adds a delay in the time it takes information to reach the relevant people on the operational railway , ie the signaller , NR control and the toc control . Also what location information is a passenger going to be able to give .Between station X and station Y , great in close metro situations , on some of the more remote sections perhaps not so great .
Now if it is just a case of a driver or passenger is having a heart attack the few minute delay it takes to relay that information is only going to have the potential to adversely effect that one person .
If it is a situation whereby hundreds of passengers are spilling out onto a live railway that few minutes could make all the difference between trains being stopped and people getting killed .
Passengers might know what a railway is in basic terms , but do the vast majority of passengers know which of the three rails is carrying electricity , which direction and at what possible speed trains could approach from . how dangerous downed OHLE could still be .
Hence my argument for a guard . In that situation a guard has the knowledge to know how to stop trains in the most efficient way possible for the location concerned . And also to direct people the safest possible way to a position of safety . The guard also has the knowledge to let the people like control and the signaller know the precise location of the train so the signaller can arrange emergency service access and control can arrange onward transport for passengers .
In practice, roads don't always operate on the principle of driving as fast as can be seen to be clear. That's why there are pile-ups in fog, etc.
Perhaps not ,but then are we taking it as a given that people do not always drive as safely as they should .
Either way even in fog people are going to be travelling at a reduced speed which lessens the severity of accidents .
Either way you wont have the situation you have on the railway in which a train can come flying round a bend and even with a full brake application can take several hundred meters to stop . The highway code stopping distance from 70mph is just shy of 100m , and this is likely to be much less with modern vehicle standards .
I'm asking why trains 'need a second safety critical member of staff', but buses, trams, HGVs, and coaches don't.
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To put it simply train crew have additional knowledge about the particular environment in which they operate that is essential to keep people as safe as possible in an emergency . As I said a guard knows how to get trains stopped and summon assistance in the most efficient way ,also being able to direct people to a position of safety in the safest possible way . Whilst most of the time they can be utilised to dispatch trains using the safest method of dispatch and can provide customer service .
Much like the additional crew on a boat or plane . They have knowledge to assist in an emergency . But they also do other jobs unless that emergency occurs .
I mean I am sure if a boat started sinking the passengers on board could phone 999 and summon the coastguard to "some area in the Irish sea" . But I am sure you would prefer secondary members of crew who knew how to use the radio and navigation equipment to summon assistance to a more specific location in a more efficient way .