Eliminating Second Seattle Rail Tunnel Could Save $4.5B, but with Major Impacts
3 days ago
- #urban-planning
- #infrastructure
- #public-transport
- Sound Transit board members discussed extending light rail to Ballard without building a second downtown tunnel, potentially saving $4.5 billion but causing delays and risks.
- King County Councilmember Claudia Balducci proposed the idea to address cost overruns, but board members expressed concerns about delays and uncertain savings.
- Two alternatives were presented: 'interlining' (using existing tunnels, saving $4.5B but with high risks) and 'stub-end' (independent line, saving $4B with fewer risks).
- Interlining would require a 3-year closure of the 1 Line and risky construction under Third Avenue, while stub-end would need a new operations facility.
- Board members, including Chair Dave Somers, were skeptical, citing risks, delays, and uncertain savings. The decision on further study will be made next week.
- Delays could push Ballard Link's opening to 2041, far beyond the initial 2035 target. Inflation and construction complexity add to the challenges.
- Seattle Mayor-Elect Katie Wilson and King County Councilmember Teresa Mosqueda will join the board soon but won't influence this decision.
- Sound Transit's existing tunnel may not handle future train frequencies without costly upgrades, adding another layer of uncertainty.
- Despite potential savings, the board appears unlikely to pursue further study due to risks and delays.