That is possible, but there were at least three, all rolled on, so I don't expect they were all being used as wheelchairs. Could be though. Maybe they would have had to fold them if it had been more crowded.You have to fold strollers on the monorail. It one was rolled on, it was being used as a wheelchair and marked accordingly. They are very strict about folding up the strollers on both the monorail and train.