UPDATE: At 9:42 p.m., Erin Larsen, who got on at Montserrat around 7:07 reported: "It’s been 2 hours and 20 min and we still haven’t arrived at North Station. Plus TWO trains (inbound) have passed us."

Shortly before 9 a.m., Keolis updated us on the fate of Train 156, which left Newburyport at 7 a.m. Read more.

The board that runs the MBTA today approved four extra inbound trains in the morning and four new trains in the evening along the Fairmount Line. Read more.

T describes the agonizingly slow pace of train 160 from Newburyport into North Station this morning:

Currently sitting in the dark behind a restroom whose door won’t close. The entire train smells like raw sewage and we are at a snail’s pace heading to North Station.

MassDOT reported Sunday night that repairs to the Worcester Line tracks near Lansdowne are "substantially complete" and that service would likely be back to normal Monday, but there's a storm coming and that might cause its own issues, in part because of some of the repair work that remains to be finished: Read more.

The Orange Line has delays of up to 15 minutes due to an inbound train with "an air pressure problem" at Haymarket.

Also, there's a dead Amtrak train at 128 gumming up service on the Providence Line.

At 8:57 a.m., T reported from Salem: Read more.

The T started with a general warning around 8:30 a.m. that Fitchburg Line riders could expect delays "due to a combination of minor train defects, switch failure & Freight train," but now they're up to delays of 50 to 60 minutes, at least on one Boston-bound train.

Bad news for people heading to Fitchburg this holiday morning: The T canceled train 2403 out of North Station and, after first telling passengers, woopsies, go take an Uber or something, decided to dig up a shuttle bus for the long ride out to Wachusett. The T is also telling passengers who'd hoped to take 2406 out of Wachusett to Boston at 1:15 p.m. to expect to ride a bus instead.

Standing on a bus from Boston to Fitchburg.

Delays on the Providence Line yesterday are being repeated this morning, if not quite as astoundingly. An hour delay on a train out of Wickford Junction yesterday has found a shadow in today's 810 out of Providence, which developed some of those "mechanical problems" and was more than 30 minutes late.

Signal problems on the Worcester Line, meanwhile, mean delays of up to 40 minutes on trains between Auburndale and South Station.