Modern Mechanix has posted a great bit about a "Unique Bus of Future to Duplicate Speed of Railroads". You've got to see the picture.
RECENT developments in everything that moves has caused many flights of imagination. Thus the fancy conjures up a bus to keep pace with other transportation. The bus between New York and San Francisco will be equipped with airplanes for trips not on the regular schedule. For diversion, billiard rooms, swimming pool, dancing floor and a bridle path would be available. The pilot would be “enthroned” over his engines, with the radio above. Space for autos would be afforded by the deck.
There's no source given, so I assume it's recently made-up and not a real historical proposal.