The San Bernardino train disaster kills four people, only to be followed a week later by an underground gasoline pipeline explosion, which kills two more people.

The San Bernardino train disaster was a combination of two separate but related incidents that occurred in San Bernardino, California, United States: a runaway train derailment on May 12, 1989; and the subsequent failure on May 25, 1989, of the Calnev Pipeline, a petroleum pipeline adjacent to the tracks which was damaged by earth-moving equipment during the crash cleanup.

May 12 is the 132nd day of the year in the Gregorian calendar; 233 days remain until the end of the year.