MBTA Police arrested a Somerville man Thursday night, after he allegedly exposed himself and masturbated in front of a female rider on a packed trolley.
Michael Galvin, 37, of Hudson Street in Somerville, was arrested by transit police near Packard's Corner in Boston, and charged with open and gross lewdness.
Officers found Galvin being dragged by his apparent victim, who grabbed him by his sweatshirt as he attempted to leave the train at the stop.
When she caught up to him, he allegedly said, "I think I need help, I think something is wrong with me." The woman held him until police arrived, according to an MBTA Transit Police report released by the agency.
Police arrived and spoke to Galvin, who said his shorts fell down accidentally on the packed and jostling train, the report said.
But the woman told a different story. Galvin allegedly approached her slowly on the crowded train. She told officers that she "got a weird vibe from the guy and tried to move away but couldn't because the trolley was so packed."
When Galvin was near her and she looked down, she said she saw that his shorts were pulled down "just enough to have his penis exposed, and he was stroking it."
The woman screamed, and Galvin reportedly began apologizing, and made for the open train door at Packard's Corner.
"You're not going anywhere," she told him, according to the report.