UPDATE, 5:15 p.m.: Whatever the problem was, it's fixed now and trains are starting to roll again.
A broken (still under warranty?) train at Government Center is raising heck with the Blue Line commute this afternoon.
At 4:45, Glenn Tremblay tweeted that there were "swarms of people waiting outside Government Center."
Shortly after 5 p.m., David Guarino reporte: "Blue Line at standstill. Broken down train, speakers say, shuttle buses between Aquarium and Maverick."