Is that 41 years working on trains, or travelling on them?
Well, Guards do have enough first aid training to put a bandage on a head. It's not rocket science. If there was a Neurosurgeon or A&E consultant on board, it is pretty-much all they could do in that scenario.
A driver collapsing scenario is not endangering the train to a large extent - it will delay it, but that's a different scenario. That's what the various safety systems in the cab are there to mitigate, and the decision was made many years ago that one Driver was all that was needed.
I agree that some of the traditional Guard roles have gone (as some Drivers roles), but the basic role of "Guarding the Passengers (from themselves)" is still there, and still required. I do agree, this message is not getting across as well as it could, through a combination of misleading statements from Management, and inerta from the travelling public.
Most of a Guards duties are low-key, and for this reason, are not recognised - indeed, on a lot of trains, are not needed. However, once they are not there, then they will be missed.
Personally, I think that if Guards agreed to work for minimum wage, this desire to remove staff from trains would not be happening - it is cost-led (backed up by McNulty), and how many posts on this thread are indirectly objecting to our wages?