A series of maps show the full extent of California’s proposed high-speed rail routes that would provide an efficient and quick way of travel between the state’s major cities.

Renewed interest has surfaced in high-speed rail travel after Brightline West, a new all-electric, 218-mile rail line bringing passengers from Las Vegas, Nevada, to Rancho Cucamonga, California, broke ground on Monday after construction was delayed for several years.

The project is expected to be completed before the 2028 Olympics in Los Angeles. The California High-Speed Rail Authority has another rail line planned that would provide a trip from San Francisco to Los Angeles in less than three hours, but progress has been slow.

According to maps on the Rail Authority’s website, the proposed high-speed rail line would traverse three regions—northern, central and southern California.

“The Phase 1 system will connect San Francisco to the Los Angeles basin via the Central Valley in under three hours on trains capable of exceeding 200 miles per hour,” the website said. “Phase 2 will extend to Sacramento and San Diego.”

A spokesperson for the Authority told Newsweek that the project is at an “exciting time.” There are 171 miles of rail line under construction, and there is environmental clearance for 422 miles.

“In the last year alone, the Authority has been awarded $3.3 billion in new federal funds to advance the work on the initial operating segment between Merced and Bakersfield, signifying a renewed federal partnership,” the statement said.

Northern California project

There are two legs to the northern California project. Phase 1 involves creating a high-speed rail line from San Francisco to Merced, with stops in between at Millbrae-SFO, San Jose and Gilroy. Phase 2 would bring travelers from Sacramento to Merced with stops at Stockton and Modesto.

For the San Francisco to San José leg of the journey, the Authority plans to introduce high-speed rail service to the Caltrain corridor. Environmental clearance was completed in 2022, and construction of the Caltrain electrification is under way.

Environmental clearance also was completed for the San José to Merced leg.

“Electrifying the existing rail corridor from San José to Gilroy will modernize the rail corridor for electrified high-speed rail service and allow Caltrain to extend electrified service to southern Santa Clara County,” the website said.

Central California project

The middle stint of the statewide project travels from Merced to Bakersfield with rail stations at Fresno and Kings/Tulare. Construction is most promising in this segment.

“The electrified high-speed rail line between Merced and Bakersfield is the first building block of the statewide system. This 171-mile line will offer the nation’s first true electrified high-speed rail service,” the Authority said on its website.

The spokesperson told Newsweek that this leg of the project is expected to be completed by 2030 to 2033.

Southern California project

The southern California stint also involves two phases. Phase 1 would bring travelers from Bakersfield to Anaheim with stops in Palmdale, Burbank and Los Angeles. Phase 2 would travel from Los Angeles to San Diego with stops at San Bernardino and Riverside. The southern California map also shows the Brightline West route.

The statewide project has been plagued with delays and price jumps. Voters approved the project in 2008, KTLA reported, with Phase 1 taking travelers from San Francisco to Los Angeles. At the time, the project was anticipated to be operational by 2020 and cost $33 billion.

Four years past the deadline, the project is still far from being completed and the price has jumped to $128 billion.

“The full Los Angeles to San Francisco line completion date is contingent on federal funding,” the spokesperson told Newsweek.

According to a U.S. House testimony by Lee Ohanian, a UCLA professor and Stanford University fellow, California began its journey to high-speed rail in 1993 by creating the California Intercity High-Speed Rail Commission. Three years later, the commission was replaced by the California High-Speed Rail Authority.

“California’s HSR project has little to show over this 30-year period. The project is significantly delayed, and its budget has increased to about four times its initial cost. Some of this is due to mistakes in planning, management, oversight, and accountability,” Ohanian testified.

“But other factors reflect more endemic challenges in building HSR, including limitations in understanding the scope and size of the problems and risks that can arise in such a major infrastructure project.”