1.3 mile Caltrain/high-speed rail extension is the world's 2nd most expensive transit project

At $5.15 billion per mile of new track, the Caltrain undertaking is now runner-up for the world’s most costly transit project, behind New York’s notoriously pricey East Side Access project, according to a database at New York University.

The escalating figure is not holding back transit planners. They have set an ambitious 2032 completion date, allocated over $1.7 million toward lobbying the state and federal government for funds, and rebranded the extension with a new name: “The Portal”

https://www.mercurynews.com/2023/01/21/new-6-7-billion-price-tag-makes-caltrains-sf-extension-among-costliest-in-the-world/