An impromptu memorial for the Marathon-bombing victims in a Green Line tunnel

Tim Murphy, who normally drives trolleys on the Mattapan Line, was driving a Green Line trolley on Saturday. At 2:49 p.m., he found himself between Hynes and Copley - basically right under the spot where the bombs exploded four years earlier. He reports:

I felt that I needed to say something. So I stopped the train just before the Copley Junction, where the Heath Street trains join the subway, and got on my PA and asked for everyone's attention. This is what I said:

"4 years ago, at this exact time, about 30 feet above this spot, the first of two devices went off and changed our city forever. Before entering Copley I would just like to observe a moment of silence to remember those who were lost and to think of those of us who continue to struggle on a daily basis from the effects of that day. On a more personal note for those running on Monday, from someone who was there in Copley Square when it happened, I can't even begin to tell you just how much it means to us that you continue to support our city. Thank you a thousand times over."

Then the train erupted in applause, something I wasn't expecting, we then observed a moment of silence and proceeded into Copley Station. The rest of that trip I had people in tears coming up and thanking me.