CHELMSFORD, MASS. (WHDH) - An MBTA Orange Line train car got stuck on I-495 northbound in Chelmsford Tuesday night after getting dislodged from the truck hauling it.

The train car remained stuck on the highway near exit as of 12 p.m. Wednesday, closing one lane and causing traffic delays.

Crews were unable to remove the train car during the overnight hours and say they are still waiting for a tow truck to arrive Wednesday afternoon.

State Police say that when the tow truck does arrive, they may need to shut down a section of the highway altogether in order to get the train car back on the road.

The new Orange Line car was on its way to Wellington Station in Medford from Springfield when it somehow separated from the tractor trailer, according to the MBTA.

An investigation into how the train car became dislodged is underway.

The train car is part of the Orange Line Transformation Project, which will phase out all the Old Orange line trains and replace them with 152 new trains. The MBTA says they have all 152 shells of the train cars produced by China, but they go to Springfield first for final assembly.

So far, 81 of those Orange Line cars have been assembled and delivered to the Boston area. That number will soon rise to 82 when the train car stuck in Chelmsford arrives in Medford.

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