WASHINGTON (AP) — Three of the biggest freight railroads operating in the U.S. have told the government that they won't meet a 2018 deadline to start using safety technology intended to prevent accidents like the deadly derailment of an Amtrak train in Philadelphia last May.

The Canadian National Railway, CSX Transportation and Norfolk Southern say they won't be ready until 2020, according to a list provided to the Associated Press by the Federal Railroad Administration. Four commuter railroads — SunRail in Florida, Metra in Illinois, the Massachusetts Bay Transportation Authority and Trinity Railway Express in Texas — also say they'll miss the deadline.

The technology, called positive train control or PTC, relies on GPS, wireless radio and computers to monitor train positions and automatically slow or stop trains that are in danger of colliding, derailing due to excessive speed or about to enter track where crews are working or that is otherwise off-limits.

The four other Class I freight railroads that operate in the U.S. — Union Pacific, BNSF, Canadian Pacific and Kansas City Southern — and more than a dozen commuter railroads have told the agency they will meet the 2018 deadline.

Amtrak, the nation's only long-distance passenger carrier, began operating a version of the technology on all tracks that it owns in its Northeast Corridor between Washington, D.C., and Boston and in some other parts of the country in December. But most of Amtrak's operations outside the Northeast take place on tracks belonging to freight railroads, making it dependent on them to install the technology. Many commuter railroads are in the same position.

After a 2008 collision between a commuter train and a freight train in Chatsworth, California, killed 25 people, Congress passed a law requiring railroads to start using the expensive technology on all tracks that carry passenger trains or that are used to haul liquids that emit toxic gas if spilled.

The deadline for the change was Dec. 31, 2015. But after it became clear nearly all railroads would miss the deadline, Congress passed another law in October extending it to Dec. 31, 2018. That law also permits the government to grant waivers through Dec. 31, 2020, to railroads that meet certain criteria.

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