The good news continues for mass transit, as the MTA announced today that the first phase of construction on the extension of the 7 Train has been completed, stretching from 26th to 34th steets, where trains will be housed as they shuttle back-and-forth between the West Side and Flushing, Queens. The Bloomberg administration, which is paying for the $2.1 billion project, put together this nice video to help demonstrate the subterranean, and thus often invisible, work. It’s the kind of stuff New York mag is calling in its annual roundup a reason to love the city: our perseverance on such mighty projects, past falterings be damned. And yet, these are exactly the kinds of capital expenditures some transit advocates are hoping to cut into to stave off the MTA’s budget crunch. Will the next stop be to stop?