Urban Aspects Cambridge MA Alewife Bike Hub.

The Alewife Station area is a well designed hub where bikeways meet. 

The Mystic Link comes in from the north via Alewife Brook.

Mass Central Rail Trail : Somerville and Cambridge.

The Massachusetts Central Rail Trail is easily the most elaborate one of the various spoke trail projects underway.

The Central Massachusetts Railroad was a line that aimed to compete as a way to Albany NY. It was discontinued in 1971.

A part of it already is proposed as a segment of the Bay Circuit in the Wayland and 
Sudbury area.