California High-Speed Rail Finishes 66 Structures, but Trains Remain Years Away

California High-Speed Rail has finished four more grade-separation and viaduct projects in Kings and Tulare counties, raising its count to 66 completed structures along the first 119 miles of Central Valley construction. The California High-Speed Rail Authority announced the completion of the State Route 43 Curved Bridge, Cross Creek Viaduct, Tule River Viaduct and Avenue 136 Underpass on October 7.

The new concrete and steel provide visible evidence that a continuous rail corridor is taking shape, but they do not constitute an operating railway. The structures are enabling works that will carry future tracks over roads, waterways and freight lines or carry road traffic over the railway. Track, electric power, train control, communications and safety systems still must be installed and integrated, while the wider program retains a substantial funding and delivery gap.

Four structures solve four crossing problems

North of Corcoran, the 660-foot State Route 43 Curved Bridge will take vehicles over the future railway. It is 45 feet wide and reaches 60 feet at its highest point. Separating highway traffic from trains removes the need for a conventional level crossing, an essential requirement for a controlled high-speed corridor.

The Cross Creek Viaduct stretches more than 2,500 feet and will carry trains over the waterway. It incorporates 222 California Wide Flange girders manufactured in Hanford by the Dragados-Flatiron Joint Venture, illustrating the industrial supply work behind the finished guideway.

At 3,573 feet, the Tule River Viaduct is the largest of the four. It is designed to take trains over State Route 43, the Tule River and existing freight tracks, combining highway, waterway and railway interfaces in one structure. Its construction uses 38 tub girders and 264 California Wide Flange girders. Immediately south, the 55-foot Avenue 136 Underpass will carry trains above two-way road traffic.

Building near active freight lines can impose coordination requirements beyond the structural work itself. The Authority’s published change-order records document other Central Valley jobs in which BNSF and Union Pacific work-window changes affected girder installation or delivery. Separate records cover expanded shoring and track-monitoring requirements. Those examples are not tied specifically to the four newly finished structures, but they show why work beside an operating railroad depends on third-party access, monitoring and scheduling.

The systems phase is the next test

Nearly 90 miles of guideway are complete and 30 structures remain under construction. By comparison, a May 2026 project summary listed 59 completed structures, 30 under construction and 33 still to finish. The increase to 66 marks measurable civil progress, yet guideway becomes useful for passenger service only when its separate sections form a continuous railway.

In June, the Authority approved a consortium of Kiewit, Stacy Witbeck and Herzog to install track, overhead electrical equipment, train control and communications infrastructure on the 119-mile section. A November 2025 board memo had targeted the start of track laying by the end of 2026, but the Authority’s October construction update does not confirm that main-line track installation has begun.

Rolling stock and certification extend the sequence further. A proposed Siemens contract calls for the first three trainsets to arrive in late 2029, with infrastructure testing scheduled to begin in spring 2030. Separate procurement reporting places high-speed testing and Federal Railroad Administration acceptance in the third quarter of 2032. The proposed trains are seven-car sets with at least 450 seats, and two could be coupled into a 14-car formation.

The current business plan calls for completion of the Merced-to-Bakersfield segment in 2033. That schedule remains exposed to policy and funding constraints: a July review by the Office of Inspector General characterized the plan’s assumption that lawmakers would approve the Authority’s priorities almost immediately as overly optimistic. Most of those 2026 legislative priorities did not pass, although a new law established a permitting framework for third-party activity within the rail right-of-way.

The Authority estimates that grade separations represented in its Kings and Tulare county graphics could produce $466 million in safety benefits over 30 years, including forecasts of roughly 670 avoided crashes in Kings County and 1,604 in Tulare County. Those are Authority projections for county grade-separation programs, not observed results attributable solely to the four latest structures.

The 66 completed structures establish where roads, rivers and freight railways will cross the future line without conventional road-rail conflicts. The milestone that converts them into transportation infrastructure will come later: continuous track, energized power equipment, working train-control systems and certified trains operating across the corridor.

By Thomas Caldwell — AMI’s senior editor for mechanical and mobility engineering, covering vehicle electronics, systems integration, electrification, chassis systems, propulsion, and safety policy.