The Santa Clara Valley Transportation Authority announced Monday that light rail service has resumed on part of the system for the first time since the end of the strike, while repairs continue in other areas.

Shortly after 10 a.m., the agency said regular service has been restored on the Orange Line, connecting the Mountain View Transit Center with the Alum Rock Transit Center in East San Jose.

The agency said the Green Line and Blue Line are still undergoing safety checks and repairs. Service on those lines would resume "as soon as possible."

Around 11:30 a.m., the agency said Blue Line service has been restored between Baypointe in North San Jose and Paseo de San Antonio in downtown San Jose.

A VTA spokesperson confirmed to CBS News Bay Area Sunday night that work to restore the system had been going slower than anticipated. The agency said the delays are partially due to copper theft but there are other issues as well.

On Thursday, a judge ordered striking workers to go back to work, siding with the VTA's argument claiming the union had broken a "no strike" clause. Bus service resumed the following day.

The 1,500 workers, which included bus and train operators, mechanics and other frontline employees, had been striking since March 10. Both sides were unable to reach a deal after months of negotiations and the contract had expired in early March.

Last week, workers rejected the latest contract offer by the agency, which included an 11% pay raise over three years.

ATU Local 265, which represents the employees, said it had planned to appeal the judge's ruling.