The Public Utilities Commission's unanimous decision to pass the temporary order came a day after investigators confirmed that the engineer of the Metrolink commuter train was text-messaging while on duty on the day the train ran a red light and collided head-on with a Union Pacific freight train.
Last week's wreck in Los Angeles killed 25 people, including the engineer, and injured more than 130.
Metrolink prohibits operators from using cell phones on the job, but the rules are widely ignored.
Under the new order the board approved in San Francisco, violators could be fined up to $20,000 per violation or have their operations shut down.
A picture of my cave
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