Following the route of Brightline West

Following the route of Brightline West

By Bob Johnston | February 4, 2025

| Last updated on August 6, 2025


Journey along Interstate 15 shows construction challenges, opportunities

A view facing northeast from the Main Street bridge in Barstow, Calif., shows the grade Brightline trains will face in following the route of Interstate 15. The BNSF main line is on the bridge in the foreground. Bob Johnston

LAS VEGAS, Nev. — Agencies in California and Nevada have issued private activity bonds for the Brightline West project, a key element in funding the 218-mile high-speed rail venture between Las Vegas and Southern California.

It is not clear whether the start of construction is contingent on obtaining money from the combined $2.5 billion in bonds offered by the California Infrastructure and Development Bank and Nevada’s Department of Business and Industry. The bonds, now being evaluated by institutional investors, are just one component in financing the $12.4 billion project, along with federal and state grants and loans.

Bond documents did acknowledge that the system would not meet its previously expressed goal of completion in time for the 2028 Summer Olympics [see “Brightline West now expecting to launch …..,” News Wire Jan. 26, 2025].

Nevertheless, shovels-in-the-ground work is poised to begin. The destination for the project’s first phase is a Metrolink Station-parking garage complex to be built at Rancho Cucamonga, Calif., about 42 miles from Los Angeles Union Station on the commuter operator’s ex-Santa Fe San Bernardino line.

Tracks between Las Vegas and Rancho Cucamonga will generally be positioned in the median of Interstate 15. The highway features steep ascending and descending grades of up to 6% at several locations, including a path following I-15’s northbound lanes up and over Cajon Pass. Because the plan promises to push the limits of worldwide 220-mph rail construction standards and operation to new extremes, Trains News Wire recently followed the route for a look at some of its noteworthy features.

Las Vegas station

Rendering of train station exterior
A rendering of the Brightline West station in Las Vegas. Brightline West

Last spring, the company held a ceremonial groundbreaking off of South Las Vegas Boulevard at Robindale Road, south of the Warm Springs interchange [see “Brightline West groundbreaking hailed …,” News Wire, April 22, 2024]. As seen below on Jan. 17, 2025, a billboard facing I-15 had been placed in front of vacant land. The building and platforms will angle to the right of the sign; the control tower of Harry Reid International Airport is visible in the distance. A facility housing the airport’s rental car operations (now far from the terminals) is set to be built near distant buildings visible to the left of the sign. Rental cars will thus be within a shorter shuttle distance to the Brightline station than the airport.

Vacant lot with Brightline West billboard
A billboard marks the site of Brightline West’s Las Vegas station. Bob Johnston

Cactus Avenue along I-15

Section of freeway near Las Vegas on Brightline West route
After tracks parallel I-15 south out of the station for a short distance, a single track will fly over the northbound lanes into the median. This will require light pole and shoulder relocation. Bob Johnston

Vehicle Maintenance Facility, Sloan, Nev.

Drilling rig on desert landscape
Geothermal boring is conducted at the site of Brightline West’s maintenance facility. Brightline West

Geothermal soil samples were taken in November 2024, on land near I-15 at Sloan, Nev., about 10 miles south of the station, where Brightline West’s Vehicle Maintenance Facility will be located. Testing has now been completed, clearing the way for site preparation and construction. Reconfiguration of the highway’s southbound lanes will permit a track to branch off from the main line in the median toward the facility. This location is also near Union Pacific’s Salt Lake City-Los Angeles rail line, from which materials and Siemens trainsets could be delivered. The light-colored horizontal embankment visible in the background supports UP’s tracks.

Yates Well Road

Highway with broad center divider
A view looking toward Las Vegas from an overpass near the Nevada-California state line shows the wide median that track engineers have to work with on many straight segments of the Brightline West route. Bob Johnston

Single track will be initially deployed on about 90% of the route, with double track strategically positioned to accommodate hourly departures in both directions. While top speeds approaching 200 mph are possible here, 15 miles of curving roadway and heavy grades into California will necessarily limit speeds. Further west, there are other stretches where the road is straight but rises and falls on 4% grades.

Barstow BNSF and Main Street

Bridges over highway, one carrying intermodal train
In addition to intermediate stations at Victor Valley and Hesperia, Calif., one of the largest median structure projects will be constructed at Barstow, Calif., where Brightline trains must fly over both the BNSF Railway main line (an intermodal train can be seen crossing on January 18, 2025) as well as Main Street. Plans call for a towering 3,800-foot structure. Bob Johnston

Cajon Pass at California Route 138 and Silverwood Lake

Multilane highway in California mountains
The view looking south on Cajon Pass from Exit 131 of Interstate 15. Bob Johnston

Coming down the south side of Cajon Pass in the narrow median, Brightline West trains would twist through a series of reverse curves on a 6% grade before hitting their stride on a straightaway toward San Bernardino. Northbound trainsets would have a much tougher slog here compared to the ruling 2.2% grade encountered on nearby tracks over Cajon traversed by Amtrak’s Southwest Chief and a host of BNSF and Union Pacific freights.

Transition off I-15

Railroad grade crossing with highway bridge in background
Another sharp, curving flyover taking Brightline West trains up and over I-15’s southbound lanes from its median to an elevated structure crossing Rochester Avenue (foreground) will be built here in Rancho Cucamonga. Looking east, Metrolink’s San Bernardino line is at left. Bob Johnston

Rancho Cucamonga station

Double-track rail line with commuter station platforms
A joint Brightline West-Metrolink station at Rancho Cucamonga is to be built over these platforms, with the high-speed trains on the upper level. An adjacent parking lot will be converted to a multi-level parking structure. Bob Johnston

Recent policy changes by the new Trump administration may have introduced an element of uncertainty, but Brightline utilized the same financing strategy during the Trump’s first term to launch its Florida operation. This project’s scope — and potential investment and mobility return — is far greater.

Share this article