After trying, but failing, to cut off a trolley at Linden Street and Comm. Ave. around 6:30 p.m., the driver of the Escalade could have backed off, let the trolley, and the other trolley coming from the other direction, through, then been on his way. But, no, of course not. As URNotinvisible shows, the guy got out of his land yacht and began yelling at the T driver.
As of 7 p.m., the T reported no problems due to yelling people standing on tracks, so presumably this particular logjam has been fixed (you didn't, however, ask about the signal problems at Park Street).