The Boston Fire Department reports firefighters responded at 3:49 a.m. to South Station for a fire in the ceiling above tracks 5 and 6: Read more.

At least six people died when an Amtrak train from Washington to New York derailed last night north of Philadelphia.

Amtrak has halted all service between New York and Philadelphia and is running "modified" service between Boston and New York.

Transit Police report a woman, about 34, was on the tracks at the Attleboro commuter-rail stop when she was hit and killed by an outbound train around 9 a.m.

Both commuter-rail and Amtrak service were halted. Police and the DA's office are investigating why she was on the tracks at the time, but foul play is not suspected.

Riders from the south and west got to enjoy the scenic vistas of the South Station rail yards this morning when Amtrak's signals failed yet again, and trains were unable to pull into the station. America's Railroad fixed the problem shortly after 9:15 and trains began pulling in.

Last month:
T says South Station problems not their fault, riders go 'Oy, gevalt!'

UPDATE: The death toll was updated late this morning, after authorities found a third body.

Two men and a woman in an SUV sitting on the Northeast Corridor tracks in Mansfield died when a Amtrak train heading to Boston slammed into the vehicle around midnight, Transit Police report.

The collision and investigating halted Acela and regional service between Boston and Providence until shortly after 7 a.m., Amtrak reports. Service on the Providence Line was slowed.

Police say they are continuing to investigate why the SUV was on the tracks.

UPDATE: Kary's last communique was at 2:50 a.m., sent from the back of an Uber car in Boston because a) there were no cabs at South Station at 2:50 a.m. and b) she already had the Uber app on her phone.

Kary was on Acela 2168, scheduled to arrive in Boston at 8:43 p.m. She reports it broke down in Connecticut west of New Haven. And then just sat there on the tracks, for 2 1/2 hours - 2 of them with no power - and no working restrooms.

MassDOT today released a drawing with one idea of what the interior of the new South Station could look like when the postal annex is moved somewhere else.

The llighter, airier feel envisioned by the rendering would seem to rule out the mixed-use tower once proposed to be built atop the station. In a post to go with the rendering, MassDOT's Klark Jessen writes:

Applauds work by Metro-North to fix the tracks.

UPDATE: Limited service to New Haven restored, but still no service past there.

Service is halted indefinitely, Amtrak reports.

The crash sent 60 people to the hospital.