Auto-Train:

In the 1970s, privately-financed Auto-Train Corporation operated passenger trains between Virginia and Florida.  The train operation was unique, not only because it started up nearly the same time that most other long-distance passenger service was either eliminated or consolidated as part of Amtrak, but also because the trains carried not only passengers but also their automobiles.  The company operated two trains which consisted of dome cars from several western railroads.  After several successful years, Auto-Train took a turn for the worse in 1976 when it had its first money-losing year after several derailments.  An unprofitable expansion on a second route in 1977 led to bankruptcy and the end of Auto-Train in April 1981.