The Brief

One of the iconic sensory experiences of riding a train is actually the sound of ingenuity. As steel railroad tracks heat up, they grow: Eighteen hundred feet of rail expands by more than an inch for every 10 degrees Fahrenheit of temperature increase. So rails used to be laid down in sections — each between 30 and 60 feet long — with small gaps.

“The very specific railway noise that you hear — chuchat … chuchat … chuchat … chuchat … chuchat — is because there is a gap between the rails, and this gap is meant for such expansion,” said Dev Niyogi, who studies urban climate extremes at the University of Texas at Austin.

Still, in a severe heat wave, the rail can swell until the underlying ties can no longer contain it. Then the rail gets visibly wavy, morphing into what’s known as a sun kink. That’s a serious hazard for trains, which can derail on misaligned tracks. In extreme cases, the track can violently buckle, going from a straight shot to grotesque curves almost instantly. So if it’s excessively hot out, rail services will slow their trains as a precaution, which provides less of the mechanical energy that can lead to buckling. Amtrak, for instance, restricts speeds to 80 miles per hour if the rail temperature hits 140 degrees. That was partly the reason behind Amtrak delays in the Northeast Corridor, which runs between Washington, D.C. and Boston, during a brutal heat wave last month. (Amtrak did not respond to multiple requests to comment for this story.)

As extreme heat waves get worse, more tracks will turn into sun kinks — disrupting commuter rail service that reduces carbon emissions and slows that warming. In 2019, a study estimated that the U.S. rail network could see additional delay costs totaling between $25 billion and $45 billion by the year 2100, in a scenario that assumed greenhouse gas emissions decline in the next 20 years.

Compared to a tree falling on top of a track and blocking traffic, or a switch breaking, heat is a much larger, harder problem for rail operators to deal with. “Heat waves tend to be regional, so the impacts can be huge,” said Jacob Helman, one of the author’s of that 2019 study and a senior climate consultant at Resilient Analytics, which provides infrastructure vulnerability assessments. “It can impact the entire Northeast Corridor over the course of five days.”

As climate change drives hotter and longer heat waves, companies are reevaluating their operations and adapting new technologies. Railroads already use remote sensors to determine the temperature of their rails, but are getting still more sophisticated as heat waves intensify. They’re using computer modeling, for example, to figure out how to make tracks more resistant to buckling, among many other steps. “The industry is implementing new ways to use advanced sensors, satellite imaging, and AI to constantly monitor track health and respond to any potential hazards,” said Scott Cummings, assistant vice president of research and innovation at MxV Rail, a subsidiary of the Association of American Railroads.

While those gaps in the rail reduce the problem of buckling, each wheel of a train rolling over each gap results in wear and tear both on the rail and the cars. In response, railroads have for decades been deploying “continuous welded rail,” or CWR — segments of track stretching a quarter mile or more. CWR is held firmly in place by concrete ties (the strips under the rails that used to be made of wood), themselves held in place with ballast stones poured in between them. “It’s all just so much more rigid,” said Daniel Pyke, a rail expert at Sensonic in the United Kingdom, which makes train safety tech. “You’ve got so much more mass there to keep everything in place.”

Railroads even adapt tracks to a specific climate: By installing continuous welded rail on a day with the right conditions, crews prepare it for the local high and low temperatures. “Tracks are laid and secured at the ‘neutral temperature,’ which is the average temperature of the rails,” said Farshid Vahedifard, a professor of civil and environmental engineering at Tufts University who studies the impact of climate change on infrastructure. “This helps ensure that the rail remains stable throughout temperature fluctuations.” As regional temperatures rise, railroads might opt to lay down track on hotter days, thus preparing the rail for increasingly extreme heat. (Though when the rails get cold in winter, they contract, which can cause cracking.)

Another intervention is painting the rails white, which reflects a good amount of the sun’s energy off the steel. “It sounds crazy,” Pyke said, “but it works.” It’s labor-intensive — you have to keep reapplying because of the wear-and-tear on the paint and the fact that it dirties over time — but track-mounted machines can do the work quickly.

Several men work on the rails leading to the new underground main station of the railway development in Stuttgart, southwestern Germany.

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Thomas Kienzle

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AFP via Getty Images

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A new technology known as distributed acoustic sensing uses fiber optic cables running along railways to “listen” for defects. Disturbances on the track jostle the optics, changing how light travels through them. That’s analyzed by a special device to determine whether a rockfall has crashed into the tracks, or if a crack has formed in the rails, as each kind of disturbance has its own unique signal.

As the track heats up and expands, the fiber optics already hear “thermal pops.” Theoretically, Pyke said, Sensonic’s technology could detect the unique ground vibrations associated with buckling. They’d just need data — perhaps they can manually heat up a test track to induce a sun kink — to train the algorithm on what to listen for. “We already produced some rock fall, landslide sensors, and they’re looking for ground vibration,” Pyke said. “So I would imagine — I can’t promise — but I would imagine we would tweak those to be able to detect it.”

If railroads can get better data on their vulnerability to buckling — like specific track temperatures over wide areas, instead of relying on inferences from local air temperatures — they could more accurately determine how much to slow trains as a precaution. That would avoid delays, keep commuters from returning to their cars, save railroads money, and generally make trains safer. “You can make more informed decisions about speed orders,” said Helman from Resilient Analytics. “Maybe it doesn’t need to be 40 miles per hour. Maybe it only needs to be 10. Maybe you don’t need it at all.”

California students are likely to see fewer cell phones and more gender-neutral bathrooms next year as new state education laws go into effect.

Protecting students from immigration raids was a priority for state legislators this year, resulting in several new laws, including one prohibiting school staff from allowing immigration officers to enter campuses or providing student or family information.

The most controversial of the new laws is one meant to target antisemitism, although amendments made during the legislative session resulted in a bill that defines discrimination more broadly.

New Office of Civil Rights to open

Assembly Bill 715 establishes a state Office of Civil Rights to help school districts identify and prevent discrimination based on antisemitism, gender, religious and LGBTQ status. It will also handle questions and complaints.

The legislation, along with Senate Bill 48, creates four positions to track and report discrimination. These positions will be appointed by the governor and confirmed by the Senate after Jan. 1.

“California is taking action to confront hate in all forms,” said Gov. Gavin Newsom in a statement. “At a time when antisemitism and bigotry are rising nationwide and globally, these laws make clear: our schools must be places of learning, not hate.”

The legislation has been controversial, with some organizations saying it infringes on academic freedom and prioritizes the rights of certain students over others. The California Teachers Association and California Faculty Association have said the legislation could result in the censoring of educators.

Parents can’t be jailed for truant kids

Beginning Jan. 1, parents of chronically truant children will no longer be fined or face jail time.

Assembly Bill 461 amends the state’s Penal Code to remove a section that makes it a criminal offense for a parent to have a child who is chronically truant, which is defined as missing school without a valid excuse for 10% or more of the school year.

California law requires students age 6 to 18 to attend school.

The Penal Code called for a fine of up to $2,000 or up to a year in jail for parents whose children habitually missed school.

“Criminalizing parents for their children′s truancy ignores the root causes of absenteeism and only deepens family hardships, especially as many immigrant families now fear sending their children to school,” said Assemblymember Patrick Ahrens, D-Sunnyvale, in a statement. “(This bill) ensures support and resources to keep students in school and on track for success.”

Gender-neutral bathroom required

Beginning on July 1, all California school campuses, except those that have only one bathroom for male students and one bathroom for female students, are required to have a gender-neutral bathroom.

Senate Bill 760, which was signed by the governor in 2023, requires that posted signs identify the designated bathroom as being open to all genders and that it be kept unlocked and available to all students.

“SB 760 is a measure that aims to create a safe and inclusive environment not only for non-binary students, but to all students, by requiring each public school to establish at least one all-gender restroom,” said former Sen. Josh Newman, author of the bill.

Cellphone use to be limited

School districts, county offices of education, and charter schools have until July 1 to adopt a policy limiting the use of cellphones during school hours.

Assembly Bill 3216, renamed the Phone-Free School Act, was approved in an effort to curb classroom distractions, bullying, and addiction to the devices. At least five other states, Florida, Indiana, Louisiana, South Carolina and Ohio, have similar laws.

Last year, Gov. Gavin Newsom sent a letter to school district leaders urging them to restrict cellphones. Excessive smartphone use increases anxiety, depression and other mental health issues in children, he said. 

Shielding schools from immigration raids

Protecting students from immigration raids was a priority for legislators this year, resulting in several pieces of new legislation.

Assembly Bill 49, known as the California Safe Haven Schools Act, was passed amid a series of immigration raids that have resulted in the arrest of thousands of people. It went into effect as an urgency measure in September.

The bill prohibits school staff from allowing immigration enforcement officers on school campuses or sharing student or family information with them without a warrant or court order. School districts have until March 1 to update school policies to align with the law.

Senate Bill 98, also effective in September, requires leaders of school districts, charter schools, universities and colleges to notify staff and parents when immigration officers are on a campus. School safety plans should include an official procedure for making these notifications by March 1.

This bill, which is in effect until Jan. 1, 2031, does not prevent governing boards from establishing stronger standards or protections.

Protecting preschools, preparing families

Assembly Bill 495, known as the Family Preparedness Plan Act, expands the pool of relatives that can be authorized to make decisions and care for children if parents are detained by immigration authorities or deported.

Beginning Jan. 1, all adults related to a child by blood or adoption, within five generations, could be authorized to enroll a child in school or make decisions about their medical care while on campus.

The bill also permits courts to appoint a person, nominated by a parent, to have joint custody of a child if they are detained or deported by immigration officials.

It also requires school districts to provide information to parents and guardians regarding the right of children to have a free public education.

The legislation also extends the requirements of AB 49 to child care facilities and preschools, prohibiting staff from collecting information or documents regarding the immigration status of children or their family. Instead, they are required to report requests for this information to the California Department of Education and the state Attorney General’s Office.

Easing the road to college

This year, California high school students will find it easier to be admitted to a California State University campus.

Senate Bill 640 establishes a direct admission program that sends mailers to high school students who are eligible to attend participating campuses, informing them of that status. Qualified students must have completed all the required coursework and maintained the necessary grade point average.

“Tens of thousands of California students are fully qualified to go to CSU, but don’t jump the hurdles of the admissions process,” said Sen. Christopher Cabaldon, D-Napa, the law’s author. “At the same time, nearly half of CSU’s campuses have substantial available enrollment capacity and need more students to sustain their high quality academic programs.”

The legislation also requires the California Community Colleges system to promote the CSU dual admission transfer program, which guarantees CSU admission to eligible community college students.

Student IDs to include suicide hotline number

Student identification cards issued at California public secondary schools and institutions of higher education after July 1 will include the phone number for The Trevor Project, a crisis and suicide prevention hotline for LGBTQ youth.

Suicide is the second leading cause of death among young people age 10 to 14, and the third leading cause of death for 14- to 25-year-olds, according to the Centers for Disease Control and Prevention.

“In today’s political climate, LGBTQ+ students face significant levels of bullying, harassment, and discrimination — negatively impacting their mental health and academic success,” according to Assemblymember Mark González, author of the bill. “AB 727 will provide critical resources to support LGBTQ+ youth in crisis and those who have experienced harassment.”

Early education to take seats on board

The next eligible seat that comes open on the California Commission on Teacher Credentialing in 2026 must go to an early childhood education teacher, according to Assembly Bill 1123.

The bill calls for one of the six teacher representatives on the commission to hold a child development teacher permit. It also reduces the number of public representatives on the board from three to two to allow the governor to appoint someone who teaches early childhood development at a university or college.

The commission, which governs the licensing and preparation of the state’s teachers, is made up of 15 voting members, including the state superintendent of public instruction, six practicing teachers, a school administrator, a school board member, a school counselor, a faculty member from a teacher preparation program, a human resources administrator, and three public representatives.

The early childhood representatives will be seated after the next eligible seat is vacated or a representative’s term ends.

In the 60 years since California first began issuing child development permits to early childhood educators, there has never been a voting member on the commission, which governs their licensure and preparation, said Assemblymember Al Muratsuchi, D-Torrance, author of the bill.

In 2025, California became the frontline of a federal playbook for more militarized immigration enforcement.

Raids on California streets and lawsuits that followed helped rewrite the ground rules for how agents can operate. What began as before-dawn operations in Golden State farm towns quickly expanded into a broader nationwide strategy: surprise workplace and neighborhood sweeps and roving patrols miles from the border.

CalMatters reporters across California documented how tactics first seen in Kern County, such as warrantless traffic stops and a heavy reliance on appearance-based profiling, spread statewide and then across the country. The U.S. Supreme Court has upheld these methods.

Early in the second Trump administration, the federal government sent Marines to the border, citing a crisis. Those troops have since quietly gone home.

Hundreds of National Guard troops were deployed to Los Angeles following civil unrest about immigration arrests. President Donald Trump threatened to send forces to the Bay Area, then backed off. State officials objected, while federal leaders characterized the moves as necessary. The standoff deepened long-running tensions between California and the White House over the state’s sanctuary policy and federal authority.

All this fell most heavily on families with deep roots in California. CalMatters found deportations increasingly reached people who have decades-long residence, U.S.-citizen children, stable employment, and even those following legal pathways. ICE detained people at green-card interviews and routine check-ins. The changes destabilized school systems, the agricultural economy, and health care.

A federal lawsuit over a deaf asylum seeker’s prolonged detention exposed gaps in medical care and disability accommodations in immigration facilities. Under Trump, asylum seekers with pending claims lost protection from arrest. A new system is emerging where people trying to follow the rules are easier targets than those evading them. Detention centers drew scrutiny as local authorities shied away from conducting health and safety inspections, while advocates reported worsening conditions inside.

A quieter but equally consequential trend has emerged: The immigrant population shrank. Love them or hate them, Trump’s immigration policies were achieving the administration’s goals. Pew Research found the national immigration population shrank by about 1.4 million people in the first half of 2025, the first decline in half a century. Economists warned about slower growth. State leaders weighed long-term impacts on the workforce, schools, and social service systems.

Enforcement grew more data-driven. Drone surveillance expanded in urban areas, and advocates warned about new uses of artificial intelligence to identify deportation targets and analyze asylum and visa applicants’ digital histories.

2026 outlook

California expects further interior enforcement, additional legal battles over sanctuary laws, funding, and renewed attempts to expand detention capacity. School districts and employers are preparing for more mass removals, while lawmakers are considering new privacy protections.

This article was originally published on CalMatters and was republished under the Creative Commons Attribution-NonCommercial-NoDerivatives license.

Days after 2025 began, two fires scorched through Los Angeles neighborhoods, the most destructive in California’s history. The Eaton and Pacific Palisades fires also renewed attention to issues such as utility oversight, insurance coverage, and the broader challenges of wildfire planning in a changing climate. And their harms rippled outward, leaving thousands of low-income workers and immigrants without jobs. 

But California found pushing its climate agenda forward to be an uphill battle this year: Ambitious climate goals faced a hostile federal government economic pressures.

Anticipating opposition from President Donald Trump, state leaders chose to abandon important clean-air rules before he even took office, including plans to phase out diesel trucks and transition to cleaner trains. Nearing mid-year, Trump and his allies in Congress blocked the state’s clean-car mandate, a blow to emissions reduction plans.

Nevertheless, as part of budget negotiations, Gov. Gavin Newsom sought to reauthorize California’s landmark cap-and-trade program, launching a debate that would resolve in the final hours of the legislative session.

Blaming climate and environmental regulation, Phillips 66 and Valero followed through on plans to shutter oil refineries, raising concerns about gas prices and the future of the state’s oil industry. In Wilmington, Phillips 66 is now closed. A high-profile explosion at Chevron’s El Segundo refinery nearby underscored persistent safety and environmental risks tied to remaining facilities.

By the end of the legislative session, these issues converged, as legislators passed a six-bill deal that included a plan to boost oil drilling, relief for ratepayers who fund wildfire mitigation, and an extension of the now rebranded “cap-and-invest” program.

As lawmakers passed sweeping reforms to California’s landmark environmental review law, critics warned exemptions may make it easier for potentially high-polluting advanced manufacturing facilities to take root in already vulnerable areas.

Longstanding conflicts over water continued to simmer this year. The governor continued pressing to fast-track a $20 billion tunnel around the Sacramento-San Joaquin Delta to send more water south — to the outrage of Delta lawmakers. And dry conditions led to dire projections for the Colorado River, a vital water supply for Southern California. They ramped up the tensions — and the urgency — as negotiators from states that rely on the river tried, and failed, to reach a deal portioning out water supplies.

2026 Outlook

Affordability, the cost of climate adaptation, and pollution harms, in the skies and in the waste stream, continue to be key issues for California. As Gov. Gavin Newsom’s balancing act continues, the state will navigate tensions with environmental justice advocates unhappy with compromises. Emerging risks include the cost – in energy and water – of data centers, and the environmental consequences of the battery economy.

This article was originally published on CalMatters and was republished under the Creative Commons Attribution-NonCommercial-NoDerivatives license.