The first car of an MBTA Green Line trolley crashed into a tunnel wall after derailing just west of Kenmore Station Monday afternoon, sending seven people to the hospital with minor injuries, authorities said.
Normal service resumed early Tuesday morning on the C and D lines, the MBTA confirmed via Twitter. Service had been disrupted after the incident, with buses shuttling passengers from Kenmore Station to Fenway and St. Mary’s Street stations.
The cause of the derailment had not been determined.
The derailed car, the first of a two-car D Line trolley bound for Riverside, veered off the tracks between Kenmore and Fenway stations, where the D Line and C Line intersect.
Boston EMS spokesman Nick Martin said several of the injured passengers reported back pain.
Some were hurt when a second trolley had to slam on its brakes to avoid rear-ending the one that derailed, the Fire Department said.
Passengers on both trolleys were escorted out of the tunnel shortly after the accident, which was reported about 12:20 p.m., MBTA spokesman Joe Pesaturo said.
At Fenway Station, Green Line riders disembarked from shuttle buses, some visibly annoyed at the delays and what they said was a lack of information from the T, while others were resigned to the interruption in their commute.
T officials waved commuters between shuttle buses from Kenmore and the outbound Green Line trolley.
Ambulances and police vehicles clustered around the station, where MBTA officials could be seen walking in and out of the tunnel where the derailed trolley remained stranded. By about an hour after the incident many of the emergency vehicles had left.
Royal Crawford, a 19-year-old student at Newbury College, said he was dismayed when he arrived at Kenmore Station and saw crowds gathered, a sure sign of a significant delay.
“It was a big cluster of people not knowing what happened,” Crawford said. “I had no clue what was going on.”
Crawford said T officials did not provide any indication of what the cause of the delay was and simply directed him to the bus that was carrying people between Kenmore and Fenway stations in a steady stream. The delays caused him to miss two of his classes, he said.
One of his fellow students at Newbury, Nikki Figueroa, 18, said the delays had thrown a monkey wrench into her day, especially as she had just come from South Station and had a suitcase in hand.
“It’s annoying,” Figueroa said. “But I’m used to the hassle of stuff like this, but it doesn’t bother me.”
Evgeny Lyandres, who was on his way home to Brookline Village from his job at Boston University, said he found that T officials communicated properly to explain the detour.
“They were helpful,” Lyandres said. His commute was taking much longer than usual, he said, but he appeared indifferent, saying “it’s hard to do anything about it.”
Gary Kriscenski and his wife, Meeyoon, were visiting Boston from Plainville, Conn. As relative MBTA newbies, they had to stop several times to ask for instructions from T staff to get to their destination.
“There was a little confusion about where we needed to go,” Gary Kriscenski said. “But we don’t get too upset or worried about it.”
@globe.com. Martine Powers can be reached at email@example.com.