Work on the 7 Line Extension is moving forward and has reached the phase where it resembles a particle accelerator. (Photo: MTA/Flickr)
![](https://animalnewyork.com/wp-content/uploads/2013/07/mta_7_line_extension_tunnel.jpg)
Work on the 7 Line Extension is moving forward and has reached the phase where it resembles a particle accelerator. (Photo: MTA/Flickr)