Somerville is seeking residents to serve on a regional group that will advise and provide feedback to the MBTA on construction of the Green Line Extension. The GLX Working Group will include representatives from Somerville, Medford, and Cambridge. Each city is selecting one community representative for each of its future Green Line station areas, as well as two at-large members. Somerville will have five GLX stations within its borders, so it will have seven representatives. Major construction activities are expected to begin in early 2018 on the $2.3 billion project, which calls for extending the rapid transit line 4.7 miles from a relocated Lechmere Station in East Cambridge to Union Square in Somerville and College Avenue in Medford. Seven new stations in all are planned, as well as a vehicle storage facility. Somerville is seeking applicants with knowledge of or experience with GLX planning, community planning, or advocacy, and/or construction management. Strong social networks in the neighborhood and multilingual capacity are also important. Those interested should submit a letter of intent by Friday, Nov. 24to firstname.lastname@example.org, or by mail to Transportation & Infrastructure Division, Somerville City Hall, 93 Highland Ave., Somerville, MA 02143.John Laidler can be reached at email@example.com.