Wheelchair2 and conductor were aware friend was trying to get off train, as conductor had the ramp placed. wheelchair2 however didn't really want to move that much and wouldn't get off the train to allow friend off.
As this isn't a normal nor a visible condition, did your friend make the conductor aware of this, and tell him that he had to provide a solution, such as requiring the other passenger to alight to let him off and that the train would not be moving until such time as he did?
If the conductor was made aware of it and did not act appropriately to resolve the situation, I think you may have a good case for at least a formal complaint, possibly more, though you would have to consult a legal professional to determine that.
Someone with an uncommon medical condition making them more vulnerable to injury cannot assume that others know this.
(Please ignore the smiley at the top, I have no idea how that got there and I can't get rid of it!)
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I know the OP says his friend was getting off, but what would have happened if Wheelchair User 2 had boarded and was not in a wheelchair space and an accident occurred resulting in death of Wheelchair 2- would the TOC be liable for damages and charges or the guard?
An interesting question. However I can't think of many cases where a collision would cause death of a wheelchair user in the vestibule when it wouldn't cause death of a standing able-bodied person in an otherwise identical medical condition, so the wheelchair would be irrelevant. A wheelchair user may, for instance, not be able to exit a train unaided in the event of a serious fire, but then that applies whether they are in the wheelchair space or not.
The wheelchair could itself cause injury, but then so could luggage placed in the same location, or a bicycle. Restraints are not always provided for the latter.
So I would conclude there is nothing special surrounding a wheelchair that would lead that way.