There were three new OL trains running early this morning, but now we're down to two. Based on anecdotal reports on Twitter, it seems like one of the new ones was taken out of service due to mechanical problems. This jibes with what I saw approaching Oak Grove, where we passed a new OL train heading southbound the was stopped a few hundred years outside of Oak Grove for unknown reasons. MBTA tweeted that a train was taken out of service at Wellington not long after. Hopefully it's nothing serious.