WASHINGTON (Reuters) - Federal officials ordered Washington’s troubled subway on Saturday to tighten safety standards because of a rail fire, a directive that followed announcement of an extensive repair program to boost reliability.

Metro trains arrive in the Gallery Place-Chinatown station ahead of a 29-hour shutdown for an emergency safety investigation of power cabling of the entire Washington Metro system in Washington March 15, 2016. REUTERS/Joshua Roberts/File Photo

The response by Metro subway employees to the explosion of a third-rail insulator and fire on Thursday showed major lapses by the system’s control center, the Federal Transit Administration (FTA) said in a directive, a copy of which was made available to Reuters.

Metro, the second-busiest U.S. subway system, must “take urgent action to address persistent safety findings with personnel response to safety risk,” it said.

The Thursday fire was the eighth smoke and fire incident involving Metro since April 23, the FTA said. Metro carries about 700,000 passengers daily.

During the Thursday fire, FTA said Metro failed to inform it of the incident and the affected track was ordered back into service after a cursory inspection.

The control center also declined to shut off power when inspectors arrived and trains continued to roll across the section, FTA said.

The agency ordered Metro to take safety steps that included infrared testing of the powered third rail, reduced train lengths and enhanced training.

Metro spokesman Dan Stessel said in a statement that General Manager Paul Wiedefeld met with the FTA on Saturday and was committed to implementing the directive.

The FTA order came a day after Metro said it would carry out wide-ranging track work that includes partial shutdowns and slower service in a bid to improve safety and reliability.

Metro was put under FTA safety supervision in October, the first time a U.S. subway had been put under direct federal watch for safety lapse.