Massachusetts Bay Transportation Authority
Some Boston residents have criticized the slowness of the trains, especially the Green Line trolleys.  Kyle Scott Clauss, the author of The Curmudgeon's Guide to the MBTA, writes: "The C branch [of the Green Line] essentially functions as a sort of moving sidewalk leading to and from the Trader Joe's in Coolidge Corner.  It was where Kenyan runner Rita Jeptoo memorably cruised past a Green Line trolley on her way to a first-place finish in the 2014 Boston Marathon."