The MBTA says new Silver Line 4 service will get riders from Dudley Station to South Station in 30 minutes, with the first, ceremonial, run scheduled for 1 p.m. on Tuesday.

Buses are scheduled for every 10 minutes during rush hour and 15 minutes the rest of the day. T officials say federal stimulus money was used to get the service started.

The existing Dudley-to-Downtown-Crossing service is now SL5. SL3, which served part of the South Boston waterfront, was discontinued.

Natasha Lloyd tweets:

The inbound Worcester MBTA train just crashed into the platform at South Station. Several people were injured. Most are ok.

WBZ tweets 12 people are being treated for minor injuries, adds the injured were all people standing waiting to get off the train. Local 718 tweets two people had to be put on backboards, one elderly.

And, of course, last night, two Worcester Line trains almost collided head on near Back Bay.

Passengers being taken away outside South Station, by NECN:

Around 10 a.m., Boston Police tweet.

Jonathan Kamens reports an MBTA cop threatened him with arrest for trying to give reporters at this morning's Google Maps/MBTA press conference at South Station flyers about incorrect bus-route information at mbta.com.

Although the building is publicly owned, it is managed by a private company, a representative of which told Kamens he couldn't exercise the First Amendment without a permit. A few minutes later, a T cop told him to knock it off or she'd have to take him away, he says.

The Globe reports on the financial arrangement between the MBTA and the private company that leases South Station.

Dan Grabauskas blames Fred Salvucci, who hasn't been in office for 20 years. The Outraged Liberal asks:

... So if this is a problem of 20 years, why hasn't anyone noticed it before, least of all the crackerjack MBTA management that is trying to pinch every penny to avoid fare hikes?

Reader Chris Rich wonders just what is in the severance deal that Grabauskas negotiated for himself that leaves Deval Patrick unwilling to pull the trigger and dump Danny early? Obviously Grabauskas must has some contract skills.

Kate Adams forwarded this photo of people actually walking around in the sunshine at noontime today, at the South Station farmers' market.

Neighbors and patrons of the South Street Diner packed a Boston Licensing Board hearing this morning, asking the board to let the long-time eatery continue to operate around the clock.

Michael Flemming said he and his wife moved to the area exactly because it's a bustling area, thanks in part to the diner, which has been open 24 hours for more than 60 years.

Today's fight-the-fare-increase day on the T as the T Riders Union, the Sierra Club and other groups attempt to get commuters riled up enough about looming fare hikes and service cutbacks to call up their state legislators to complain.

But Spatch reports it didn't go quite as well as it could have at South Station this morning, tweeting that:

MBTA fare protestors handing out flyers @ So. Station are upstaged by people giving out free Vitamin Water. Feels almost Machiavellian.

Chris tweets that there was a security checkpoint at South Station this evening, he declined to answer any of their questions, but they let him through anyway.

Carmen reports the cop didn't seem very happy about it, but he still ran a busker out of the South Station T stop last night for not having a permit - and that really annoyed all the people who'd been listening to him:

... One woman thought it was all her fault, that she had brought attention to the busker by asking him to play a song for her. She had been singing along when the mean cop came along. "I feel terrible," she said. "I've been working up my courage for weeks just to ask him to play that song for me."