WASHINGTON — The Obama administration suggests scaling back by 10,000 miles a federal mandate that positive train control (PTC) be installed on some 140,000 miles of freight and passenger track no later than Dec. 31, 2015.

The 10,000 miles represents track over which freight railroads say neither passengers nor dangerous hazmat will be transported in 2015.

PTC is a crash-avoidance safety overlay system long supported by the National Transportation Safety Board and rail labor organizations. Installation of PTC was required by the Rail Safety Improvement Act of 2008, with the FRA subsequently setting the 140,000-mile mandate, which was said to encompass all track over which passengers and the most dangerous hazmat cargo travel.

Bloomberg business news writer Angela Greiling Keane reports that the proposed 10,000-mile scale-back of PTC is part of a White House initiative to repeal or modify regulations at 30 federal agencies said to pose a significant compliance costs to American business.

The Association of American Railroads had previously filed a federal lawsuit seeking the 10,000-mile scale back of the PTC mandate; and rail CEOs earlier this year visited the White House to plead for administration support.

Railroads contend that the 140,000-mile FRA mandate for PTC installation is based on outdated hazmat traffic data, and that railroads will not be transporting those hazmat cargos over the 10,000 miles sought to be removed from the mandate. The Association of American Railroads says the removal of those 10,000 miles from the mandate will save the industry some $500 million in installation costs.

There is currently no provision to liberalize the timetable for installation of PTC over the remaining 130,000 miles of track.