Without proper maintenance, diesel engines can experience something called runaway -- the engine continually revs, no matter what the driver does.

INDIANAPOLIS - A runaway horse pulled a carriage with two out-of-town tourists on a wild ride through downtown streets, until a teenager rode to the rescue in a pursuing taxi, ...

Video taken on May 26, 2025, shows a runaway horse, named Shadow, pulling its carriage in Central Park without its driver, ... He said he got hurt trying to stop the horse.