Live Boston reports that shortly before 10:30 a.m., somebody in one car started shooting at somebody in another car on Park Street, near Claybourne Street, behind the Roxbury Prep middle school on Regina Road. No injuries, but plenty of spent shells at the scene, from which two cars fled at a high rate of speed.

Transit Police report two out-of-town visitors, one 17, the other 19, who came into Boston for "a day of leisure" on Monday had a fun day with a group of strangers they met on the Common - until the group led them into the Park Street T stop. Read more.

Around noon, a B Line trolley slipped off the rails at Park Street, sending the T to both right the train and alert the few remaining Green Line passengers that they'd need to take the Orange or Red lines if they needed to get to Park Street.

Update: One arrest made.

Transit Police have released photos of one of the two men they say repeatedly kicked and punched an elderly man around 9 pm. on Saturday on a Red Line platform at Park Street. Read more.

New England Folklore recounts the story of the two elms that flank the Robert Gould Shaw memorial at Beacon and Park streets - planted by John Hancock himself before the Revolution. Turns out the memorial sits on a vault designed to protect the roots of the trees.

Protest starts at 2 p.m. outside the Park Street T stop. Read more.

A. He has a wooden leg. The Globe's Emily Sweeney reports on the 1955 fall her grandfather took onto the tracks at what was then Park Street Under. Afterwards, he made the news around the world.

Shortly after 6 p.m., Steph Wilkinson reported somebody punched a window on her car of an Alewife train leaving Park Street: "Most of it is cracked." Read more.

Aaron Rosenberg spotted this fare-increase advisory being used to block a Park Street escalator that's been out of service for three weeks - after he had a "45 minute commute to go 3 stops." Also, note the date on the sign.