There were two notable accidents before that, one in California where 25 people were killed on a commuter train due to the conductor texting, and another in Boston on a trolley (where there were thankfully no fatalities).
Well, it seems the recent San Antonio accident was the last straw for U.S. Secretary of Transportation Ray LaHood. He is now trying to work with Congress to enact a total ban on mobile devices for transportation workers. The question is, how long will it take and once a bill is written, will it pass both houses? Only time will tell.