WASHINGTON (AP) — Only one-fifth of its track will be equipped with mandatory safety technology to prevent the most catastrophic kinds of collisions and derailments by the deadline set by Congress, the freight railroad industry said Wednesday.

The Association of American Railroads said in a report that about 20 percent of the approximately 60,000 miles of track being equipped with the technology will meet the deadline of Dec. 31, 2015. Previously, the association had estimated 40 percent would meet the deadline.