An ambitious state-run high-speed rail project linking Los Angeles and San Francisco has gone off track.

High-speed rail can be found around the world. Yet so far, the projects haven't tracked in the U.S., where both the public and private sectors have faced ballooning costs and delays.

In the modern age of travel, people expect to get where they need to go fast. This includes traveling by train, especially bullet trains, which can reach incredible speeds. If you live in Brazil, ...