Metro unveils Purple Line phase 2 TBMs

21 June 2019

US - The Los Angeles County Metropolitan Transportation Authority (Metro) joined elected officials and community members in Century City for a ceremonial naming and unveiling of its second set of TBMs that will dig twin subway tunnels between Beverly Hills and Century City, on Monday. Subway tunnelling is expected to begin in early 2020.

The names “Harriet” and “Ruth” were selected from a winning entry submitted by a sixth grade student after Harriet Tubman, known for her role in the Underground Railroad, and Justice Ruth Bader Ginsburg, who fights for gender equality and social justice.

“It is so fitting to have Harriet and Ruth, named after two of history's greatest sheroes, blazing the path for this critically important transit project," said L.A. County Supervisor and Metro Board Chair Sheila Kuehl. "We are glad to see such enthusiastic community involvement in naming these new TBMs.”

Metro said it has received the cutterhead and shield for its TBMs, which are now staged at Metro’s Century City Station construction yard. TBMs will be assembled at the station site and will dig eastward to Wilshire/La Cienega in Beverly Hills. Metro’s Section Two contractor, Tutor Perini O&G, is building this portion of the project.

“I’m proud to welcome our two newest Angelenos — Harriet and Ruth — who embody the best of the Angeleno spirit,” said Metro Board second vice chair and Los Angeles mayor Eric Garcetti. “Their work will continue our great progress toward realizing an integral part of our transportation future — a reliable, sustainable connection between Downtown and the Westside.”

The TBMs are manufactured in Germany by Herrenknecht AG. They weigh approximately 1,000 tons, are 400ft long and are 21.75ft in diameter. They will advance about 60ft per day once digging begins. The depths of tunnels will vary throughout the underground alignment, ranging from 50 to 120ft. TBMs will tunnel five days per week, 20 hours per day and take approximately two years to complete their work.

“With the arrival of these two new TBMs, we are another step closer to bringing the Purple Line Extension to reality,” said Metro CEO Phillip A. Washington. “When it’s completed, the subway will reduce travel times between the Westside and Downtown L.A. to just 25 minutes and give Angelenos a new high-speed, high-capacity transit alternative they’ve been waiting many decades to ride.”

The second section of the Purple Line Extension Project spans 2.59 miles and includes two new stations at Wilshire/Rodeo in Beverly Hills and Century City/Constellation in Century City. The extension is expected to open in 2025.

Overall, the Purple Line Extension Project consists of three construction phases. When complete, the project will extend Purple Line service nine miles farther west and include seven new stations: Wilshire/La Brea, Wilshire/Fairfax, Wilshire/La Cienega, Wilshire/Rodeo, Century City/Constellation, Westwood/UCLA and Westwood/VA Hospital. When the entire project is completed in 2027, the subway extension is expected to serve 59,000 riders daily – including 17,000 new riders. The project is funded by Measure R, federal grants and accelerated by Measure M, the two most recent sales tax measures approved by Los Angeles County voters for transportation improvements.