Los Angeles, long celebrated as the archetypal car-centric city, is on the brink of a transformative shift as it revives its once-thriving rail transit system. Over the past thirty years, the city has been diligently reconstructing a network of trolleys and subways. This May marks a significant milestone with the opening of a new four-mile subway segment along Wilshire Boulevard, featuring three new stations. This vital east-west corridor will drastically reduce travel time, transforming what can often be a lengthy drive through one of the city’s busiest areas into a swift 25-minute train journey.
The addition of subway stations in the Miracle Mile area represents a remarkable feat of engineering, particularly given the geological challenges posed by the region. Historically, the ground beneath this locale has been fraught with hazards, including methane deposits—a serious concern that culminated in an explosion in 1985, leading to the rerouting of train lines away from the area. However, recent advancements in tunneling technology have enabled engineers to safely navigate these challenges. According to James Cohen from LA Metro, the introduction of an earth-pressure-balance tunnel-boring machine has revolutionized the excavation process. This sophisticated equipment can safely burrow through volatile ground conditions, transporting excavated material to the surface via conveyor belts while constructing a robust, gas- and waterproof tunnel.
Excavation for the new stations has been executed with minimal disruption to surface traffic, primarily conducted during weekends. While the project faced delays and exceeded its budget—costing nearly $4 billion for this segment alone—the outcome promises to be transformative for the city’s transit landscape. Despite ongoing challenges such as the need for increased housing and pedestrian-friendly developments to maximize the benefits of this extension, the new subway stations signal a pivotal moment in Los Angeles’s public transportation narrative. As the city embraces its underground potential, it appears that the long-awaited return of a robust transit system may finally be at hand.
Source: Los Angeles is finally going underground via MIT Technology Review