No, it's much simpler than you are probably imagining. The cart locks to the one in front using a short chain with a plug between a device attached to the handl

No, it's much simpler than you are probably imagining. The cart locks to the one in front using a short chain with a plug between a device attached to the handlebars of each cart. It comes out of the back of one and locks into the front of the other. Put a coin(or any coin shaped object) in and a simple mechanic latch releases the chain, plug it back in and you get your coin back.