One of the original red tour buses at Glacier National Park in Montana:

These sweet machines were built by the White Motor Company between 1936 and 1938 — and rebuilt in 2000 by Ford. Now they run on propane (93 percent cleaner running than the original engines) and have automatic transmissions, but the originals had somewhat finicky manual transmissions — thus the nickname, courtesy of the driver’s need to “jam” the transmission into gear.