Below, sparks fly as a worker uses an angle grinder to smooth edges of a steel bracket inside the north concourse, where temporary steel reinforcing is being installed.

An underground view of the southeast corner of the Union Square Garage where construction of the north station entrance is ongoing.

If you would like to see more photos of project construction, check out our Flickr, updated weekly!

Our offices have moved. We are now located near the portal to Chinatown, at the edge of Union Square.  Our new address is 530 Bush Street.

We can be contacted at central.subway@sfmta.com.

New foundations for overhead wires are being installed along the surface portion of the alignment from Townsend to Bryant.

Utility installation and upgrade work continues at the intersection of 4th and Townsend.

If you would like to see more photos of project construction, check out our Flickr, updated weekly!

Waterproofing vinyl and a slab of concrete now cover a new section of roof deck on the north side of the O’Farrell and Stockton intersection.

Underground, workers drill inside the station box between Geary and O’Farrell streets.

If you would like to see more photos of project construction, check out our Flickr, updated weekly!

Here is a look at the work taking place underground, where construction crew members mix materials for the next phase of mezzanine floor slab construction.

An up close photo of a carpenter as he cuts wood for the next section of the station box.

If you would like to see more photos of project construction, check out our Flickr, updated weekly!

Huge beams are used as temporary support during the excavation phase of construction.

A worker welds ventilation equipment at the north access shaft near Jackson Street on Stockton.

If you would like to see more photos of project construction, check out our Flickr, updated weekly!

Drilling equipment is used to prepare site for excavation and construction of the roof deck.

View of work staging area where dirt is removed from the north concourse of the Union Square|Market Street Station.

If you would like to see more photos of project construction, check out our Flickr, updated weekly!

The much-appreciated plaza features a nightly light show that is projected onto the Macy’s Men’s building, featuring San Francisco landmarks and holiday themed-images.

Shoppers, pedestrians, visitors and locals of all ages can enjoy the open space, festive decorations and special seating in the plaza through the first of January.

If you would like to see more photos of project construction, check out our Flickr, updated weekly!

A portion of the new track interchange at the intersection of 4th and King was installed over Labor Day weekend.

The Labor Day Weekend was a busy one for the Central Subway Construction Crew.  While many residents enjoyed the final weekend of summer relaxing at the beach or the park, traveling out of town, or attending the Billy Joel concert, our team worked around the clock at the intersection of 4^th and King as part of the construction of the future 4^th and Brannan surface Station.

The work began at 7p.m. Friday, September 4th and ended at 5a.m. Tuesday, September 8th.  Trackwork, infrastructure and signal priority upgrades were installed at the intersection of 4^th and King.   These upgrades accommodate the future Central Subway alignment and will make transit safer and more reliable.  When the work was over, trains were tested to confirm success.

The Labor Weekend Construction completion was a major milestone towards the completion of the Central Subway.   There’s more to come.   The work at 4^th and King was the first phase of a two-phased construction project.   The intersection of 4^th and King was shutdown re-routing public transportation and drivers around the work. People used Barry St. and Townsend St. as alternate routes. We can expect a very similar shutdown for the 2^nd phase of the project.

More upgrades and track will be installed, with an exciting twist.   After completion, the San Francisco public will see the straight line of track that will lead to the new Central Subway Alignment.   Currently, the T Third curves at 4^th and King, the new tracks will go straight towards the 4^th and Brannan surface station.   When the entire Central Subway is completed, T Third trains will go straight from 4^th and Brannan towards the Yerba Buena | Moscone, Union Square | Market Street and Chinatown underground stations.

The Central Subway Team would like to thank our neighbors and merchants for their patience and cooperation during Labor Day Weekend.    Train travel and traffic were affected.    This construction will benefit the community greatly when revenue operations begin in 2019.   Transportation from SoMA to Chinatown will only be 8 minutes when the Central Subway is complete.  BART and other Muni lines will be easily assessable from the T Third.

Project Director John Funghi accepts the ASCE Transportation Project of the Year award on behalf of the Central Subway Project, a 1.7 mile-long extension of the Muni T Third Line.

The ASCE accolade was given to the Central Subway project, named the Transportation Project of the Year for 2015. When open for revenue service in 2019, the Central Subway will connect the northern and southern part of the city.

Want to see more photos of project construction?  Check out our Flickr, updated weekly!