Los Angeles is finally going underground

MIT Technology Review
by Adam Rogers
April 22, 2026
10 views
2 min read

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The Bottom Line

Los Angeles is significantly expanding its underground public transportation system to reduce car reliance.

How This Affects You

If you live in Los Angeles, new subways and trolleys could reduce traffic congestion and offer more public transit options.

AI Summary

Los Angeles is set to open a new four-mile subway segment with three new stations along Wilshire Boulevard in May. This segment, connecting downtown LA to the Pacific Ocean, will transform what can be an hours-long drive into a 25-minute train ride. The project, which cost nearly $4 billion for this segment alone, represents a technological triumph over challenging geology, including tarry ground and methane deposits that previously caused an explosion in 1985. LA Metro's James Cohen noted that earth-pressure-balance tunnel-boring machines were key to safely digging through gas-packed ground. This expansion aims to rebuild the city's rail transit network, despite not finishing on time or under budget.

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