What is the only place on Earth where a boat can sail under a train that is traveling under a car that is driving under a flying airplane?

The East River, if the subway-carrying bridges are taken into account. Atone time this applied to "Frisco when the Bay Bridge (the larger of the two) had the Key System rapid tansit operated by but separate from the Southern Pacific. as a sort of treaty thing, the controls were arranged different than normal Railroad units or subway cars, the positions of throttle and brake lever were reversed. I do not need to get into trade secrets of the High Iron, but the Key system opposite.