What RTD says could be due to “possible damage on the overhead catenary system” prompted what they’re categorizing as “severe” delays on four popular light rail lines Tuesday afternoon.

The repairs have since been made and the E, F and H lines (which run on Interstate 25) between Broadway and Belleview are back in service.

Service was suspended on these lines for around two hours, and passengers were forced to take bus shuttles.

Though the repairs have been made, RTD said to expect delays for the rest of the afternoon.

According to Amtrak’s website, a catenary system is what provides electrical power to light rail trains. It's unclear what caused the damage.