Michael Femia reports a trolley acting as a plow got stuck on Huntington Avenue by the Museum of Fine Arts around 12:30 p.m. Yacques reports it derailed and took out a street light and hit a pole.
In the photo above, that yellow thing was the plow attached to the front of the trolley.
Frederick also happened to photograph the snow mound that did in the trolley before the trolley arrived: