The answer to last week's clue is the railroad trestle over Village Street in West Medway. The picture is of the existing east abutment of the trestle. It came into being in 1897 when the railroad refused permission for the street car line to cross its tracks at grade. In those days, Village Street ran from its Chicken Brook Crossing directly toward Wood's corner, running just infront of the two Campbell Mill houses. It crossed the railroad at a grade crossing east of the West Medway depot and at about mid-way between the Cephas Thayer house and the Campbell houses.
Due to the terrain, the railroad had already constructed a fairly long fill, or embankment, for its tracks from Cottage Street to nearly the West Medway depot site.
When denied the grade crossing, the street railway company ran its tracks along the northerly bank of the railroad, and tunneled under the railroad just easterly of Chicken Brook. The conditions of doing so required the street car company to make a right-of-way sufficient for travel for other vehicles, and the village street trestle was the result.
The tunneling under the railroad preparatory to installing the trestle gave the name of the "Subway" to that part of the street car route, and "Subway" it has remained for all these years.
The course of Village Street was later changed to follow the street railway line.
At Medway Village, the Franklin Street railway branch followed Sanford Street across the Charles River Bridge, and on the south side of the bride, instead of breasting the steep hill, took a course easterly, which can still be discerned.
Thank you to Tim Rice for providing this history. Resource: The New Grant: A History of Medway