I spent 20 years as a Travelling Ticket Inspector and 17 as a Guard on the Mid Hants Railway. During that time the number of people who could not open or close the doors on the carriages was amazing. On at least half my duties I met people who were pushing the rubber door stops in an attempt to open a door! On one occasion I was asked by a teacher, who was leading a school party, to close the windows and turn the air conditioning on as it was too hot. She was most upset with me when I explained that having the windows open was the only air conditioning that Mk 1 carriages have.
I have travelled widely on other preserved lines and witnessed the same behaviour at most of them. The public do not understand Mk 1 doors and unless the staff watch them carefully they can cause a dangerous situation at any time on a journey.