Potentially rolling out a software change that requires testing out of service...
EDIT: literally just saw this on Twitter. Sounds like there was an issue on the run three days ago with a door opening while in motionthat'll probably take them out for a few days minimum while software is fixed. Chris Friend has traditionally been a pretty reliable source, he does a ton of analysis of MBTA data.
I was initial skeptical of this, but the time matches perfectly with the last revenue service run of the new OL trains (they haven't run since). And the train that was pulled has only done 2 trips that day, when they had been averaging 6 trips daily. https://t.co/hFqfCrScqa
— Chris Friend (@friendchristoph) September 25, 2019
That's too bad. They were not in service again this morning. Hopefully it doesn't take too long to fix.