What happened in Massachussets on Jan 9, 2007?

I was taking the train from Portland to Boston this morning. I noticed a sign just south of the station in Woburn saying " Remember forever January 9, 2007 ". This sign was in a rail yard, and on its own post.
What happened that day?

The only thing I can find in a quick google is the announcement of the first iPhone.

Per the second entry on wiki under Jan 9 2007 Massachusetts, there was a collision of Massachusetts Bay Transportation Authority Train 322 injuring 10 and killing two.

That’s the day Steve Jobs unveiled the first iPhone. Bit of a stretch, though.

It was apparently caused by a lack of signal protection:

So certainly something to remember.

This post on the NTSB site confirms that. The crash occurred near the station the OP refers to:

http://www.ntsb.gov/news/events/Pages/Collision_of_Massachusetts_Bay_Transportation_Authority_Train_322_and_Track_Maintenance_Equipment_near_Woburn_Massachusett.aspx