The MBTA reported that buses will replace Green Line trains from Government Center to Kenmore after a second fire broke out at Arlington Station.
The Boston Fire Department responded to a report of a fire at Arlington Station at 9:41 p.m.
The Fire Department said in a tweet, "Chief advises this was a cable issue again in same junction box as this morning."
An electrical problem at Arlington Station forced a partial service shutdown Wednesday morning at about 10 a.m. during the one of the coldest days this year.
Firefighters put the fire out and reported that there were no injuries.