SHANGHAI (AP) — A Shanghai subway train crashed into another that was stopped underground Tuesday afternoon, injuring more than 210 people in the latest trouble for the rapidly expanded transportation system in China’s commercial center.

The crash occurred after Shanghai Shentong Metro Group blogged that line 10 was having delays due to equipment problems. Line 10 opened just last year as one of the city’s newest subways.

At least 212 people were hurt, three seriously, the metro operator said. It said none had life-threatening injuries, though some of the injured were carried away on stretchers.

“This is the darkest day ever for the Shanghai subway. Regardless of the cause or responsibility, we are stricken with remorse for having caused our passengers injury and losses,” the company said in an apology posted on its blog. “We want to deeply, deeply apologize.”

The crash follows a July 23 collision of two bullet trains in southeastern China that killed 40 people and injured 177, bringing into the open festering resentments over the huge costs of the country’s massive buildup of its rail system, especially its high-speed trains.

Authorities have not yet disclosed the results of an investigation into the cause of that accident, though state media cited officials saying signaling equipment was thought to have been a key factor.