I didn't look for pedals, but it looked more like what mom2rtk described as a 3 wheel stroller.
It caught everyone's attention because the child jumped out of the stroller and unlatched the chain used to block access to the first car. You can see that the chain has a handicap flag on it. There is usually a CM standing there to open the access as needed. The father first tried to push the double stroller between the rails but it was too big. He tried to fold the stroller, but couldn't fold it small enough to squeeze between the rails. It caused quite a scene. After the father got it folded, there was no room for the two women and children so he unlatched the chain to another cordoned off handicap lane for the rest of his family. Unfortunately, there were no CM around to stop him or re-direct him to the ramp.