I don't regard a bike, or two bikes, in a doorway that also blocks access to the aisles and requires the owner(s) to get up and move them, as being good in the case of an emergency where people need to exit quickly.
We can assume the chances of needing to evacuate quickly is a VERY slim chance thanks to our high safety standards, but the risks do still exist nonetheless.
It is
almost never the case that the best thing to do in the event of a train crash is to exit quickly. A train is not an aircraft. The emergency procedure posters make that very clear, and over time a number of people have been killed as a result of pulling the door release and self-evacuating when to stay put or move to another carriage would have been much safer.
In any case, having pulled the egress handle, it would be quick and easy to shove any obstructing bicycles or luggage straight out of the door prior to exiting yourself.
Aircraft are very different indeed. Small doors (particularly the overwing), huge amounts of fuel on board, little crashworthiness beyond minor landing incidents, massive fire risk. Were they not, I suspect rail luggage allowances would be much tighter, and bags in doorways would not be tolerated in the way they are.
Blocking the aisle is not really acceptable, as you say. The above refers to when only the vestibule is blocked on one side where there is no platform (I mentioned the south WCML as an example of very consistent platforming).
--- old post above --- --- new post below ---
What if the tip down seats could be locked out of use somehow, so in the peak where bikes may not be allowed, they're in use, and then a member of staff locks them back when bikes ARE allowed so the area can only be used by bikes.
Then on the floor, TfL bus style, have a big picture of a bike so it's clear it's for bikes. Add a sticker to say that the area can be occupied by passengers between nn:nn and nn:nn and job done.
Not that expensive to do I'd have thought.
That seems a quite reasonable idea to me. In multipurpose areas like the 350s they could also be unlocked for a wheelchair passenger's companion.
To add to the above, as a cyclist who occasionally transports a bike by train (not often, though, it mostly just takes me to the station) I would be happy to pay a fee for carriage if that allowed enhanced facilities to be provided.