The MBTA announced today that the first scheduled service on the Green Line Extension to Union Square won't be until at least March of next year.
The T blames "challenges reaching productivity targets for the completion of the project’s first traction power substation as well as other key construction and testing activities" for the delay. Previously, the T had hoped to begin service to the stub line to Union Square by December.
The T adds:
Traction power substations provide electric power to operate Green Line trains along GLX. While work has been proceeding, the project encountered productivity challenges in completing the electrical work for GLX’s first traction power substation. As the project finishes some remaining work within the substation, functional testing of the electrical and communication components of the system is well underway.
But what about the main part of the extension, to Medford? The T didn't say if there's anything that could hold up its opening, still listed for May, 2022.