A number of train bridges cross Rte. 128, but as Chris Rich shows us in Waltham, not all are in use. This bridge is part of the Wayside Trail, which could one day become a pedestrian and bicycle path along the right of way of a long unused train line between Boston and Northampton.
Also see Rich's other photos from along the abandoned line.
Copyright Chris Rich. Posted in the Universal Hub pool on Flickr.