Technology eventually advanced to a point where the railroads, in an effort to save money by reducing crew members, stated that cabooses were unnecessary. New diesel locomotives had large cabs that could house entire crews.
Where did all the cabooses go?
The caboose was largely replaced by technology. Today, railroads utilize End of Train Devices (EOTs), sometimes referred to as a flashing rear end device (FRED), in place of the caboose. The EOT attaches into the air hose on the trailing car in the train.