UPDATE: The power problem is on account of the third rail catching fire.
From the T web page:
Orange Line notice: Due to a power problem at Malden Center, please board on the northbound platforms between Oak Grove and Wellington for northbound and southbound service.
A shuttle train will operate in both directions between Oak Grove and Wellington Stations. Please board on the northbound platforms.
Last Updated: 10/11/2016 10:16:15 AM