The Park Street MBTA station reopened Wednesday after Boston firefighters determined that smoke coming from a Green Line car resulted from a mechanical issue, not from a fire, officials said.
The Green Line portion of the station, one of the T’s main subway hubs, was closed around 1:09 p.m. while firefighters and MBTA employees investigated. Streets around the station were also closed to allow fire apparatuses to reach the station.
In an e-mail, T spokesman Joseph Pesaturo wrote that the cause of the smoke was mechanical.
“An overheated trolley motor burned out,’’ he wrote.
Green Line trains were running in both directions at the station around 1:45 p.m., except for a vacant D Line train to Riverside that sat on one of the tracks.
Meriel Arcega, 42, a clerk at a concession stand at the station, said the Green Line platform became smoky around 1 p.m., and it smelled “like plastic burning.”
“A lot of smoke,” he said.
Arcega said it took firefighters about 25 minutes to extinguish the smoke, and 30 or 40 passengers had to evacuate the affected train.
“They looked confused,” Arcega said.
The station serves both the Green and Red lines and is located in a corner of the Boston Common that is in walking distance of the State House.
Meanwhile, Downtown Crossing station has reopened. Starting around 1:49 p.m. Wednesday, Red Line and Orange Line service was temporarily bypassing Downtown Crossing station in both directions because of a burst pipe.
Pesaturo said the pipe was at street level (above the station).
He said the water had been shut off and MBTA maintenance and cleaning personnel were on scene.