These are "self service" rides. They don't have operators. When you want to ride you get on the ride and someone else has to close the gate. Then that person has to push the green button. After that you may push the button on the car and the ride starts. After the ride ends, the other person, not riding, has to open the gate. After that, you can push the bar-button to open the bar and to get out.
This "large" model has one more support on each side making it a 25%-33% larger than the original.