By David Shepardson

WASHINGTON (Reuters) -Two U.S. senators on Monday urged the country’s auto safety regulator to investigate reported failures of Tesla’s Full Self-Driving system to detect and safely respond to railroad crossings, citing risks of “catastrophic” collisions.

The Full Self-Driving system, according to Tesla’s website, allows a vehicle to drive occupants “almost anywhere,” handling everything from route navigation to lane changes, steering and parking, but still requires supervision by a human driver.

Democratic Senators Ed Markey and Richard Blumenthal, in a letter to the National Highway Traffic Safety Administration calling for a probe, cited a growing number of reported near-collisions.

“Although mistakes such as a missed traffic sign or an illegal lane change are da

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