BART says it will formally study the decades-old ideas of building a second Transbay tube and extending service to SF’s western neighborhoods.
Ellen Smith, BART’s acting manager for strategic and policy planning, recently told a SF County Transportation Authority Board committee (comprised of SF supervisors) that regional transportation agencies plan to fund a study of a subway connecting the South of Market area to Alameda, with a possible extension west underneath the Market Street subway, towards the Richmond and Sunset Districts.
BART has only sketched out the ideas as conceptual routes, and has yet to provide even a ballpark estimate of a timeline or costs.
Don’t expect to take a ride anytime soon, though: “We could be talking decades,” Smith said. Building a new underwater tube is ”clearly a massive investment and undertaking, technically, operationally, financially, and politically.”
The tube would be a key piece of the infrastructure needed to accommodate the growing number of riders squeezing into the existing Transbay tube, BART’s busiest section of track.
A second tube would “greatly increase our capacity, but probably not double it,” said Smith. It would make the system more resilient, keeping service running even if minor mechanical problems occur within the existing two-track tube. It would also make 24-hour service possible, since BART maintenance crews currently need to clear the tube for nightly work.
The current single tube “was planned in the 1960s, when there were only 3.6 million people in the Bay Area,” a small fraction of the 9 million expected by 2040, said Smith.
The ideas for BART expansions in SF are hardly new, but it’s the first time BART said it will study them.
SPUR has long pushed the idea of a second Transbay tube, and explained its vision in a video in 2011. In the meantime, the organization says bus service should be given higher priority on the Bay Bridge with the creation of a contra-flow transit lane. Smith said BART is considering launching a new Transbay bus service, but the Metropolitan Transportation Commission has only just begun preliminary consideration of a transit lane on the bridge.