While waiting for a trolley at 13th Street, I saw a woman try for about five minutes try to get her shopping basket through the rear doors of an 11 trolley. She took stuff out to make it lighter, this did not work. Her cart was just wider than the doors. I think she had a friend or relative with her who was very mortified. She was finally able to get the basket on with the help of a man. The key was to turn the shopping basket sideways.
I just wish I could have seen her try to exit the trolley, because it took about 5 or 6 minutes to get everything onboard.