LOS ANGELES (AP) — Educators and parents wearing ponchos and rain boots and carrying umbrellas gathered downtown to march from City Hall to district headquarters in the pouring rain, pressing for higher pay and smaller class sizes that the district says could bankrupt the school system with 640,000 students.

“Students, we are striking for you,” teachers union President Alex Caputo-Pearl told a cheering crowd.

Teachers aim to build on the momentum of successful walkouts nationwide, which launched last year in conservative states and now have moved to the more union-friendly West Coast. But unlike those strikes that shut down many schools and forced parents to find other care for their kids, all 1,240 K-12 schools in the Los Angeles Unified School District were open.

Bus service was normal, breakfast and lunches were being served, and “students are safe and learning,” Superintendent Austin Beutner said at a press conference.

The district has hired hundreds of substitutes to replace educators and staff members who left for picket lines, a move that the teachers union has called irresponsible.

Below are scenes from Monday’s march:

Striking Teachers and parents in support picket in front of Trinity Elementary against #LAUSDStrike pic.twitter.com/hAjTVF1uWv — Gary Coronado (@gary_coronado) January 14, 2019

But now there’s a picket line. Teachers and psychologists from the elementary school and early learning center are on strike for smaller class sizes, increased pay, more mental health services + #LAUSDStrike pic.twitter.com/JN2B08EGcC — Priska Neely (@priskaneely) January 14, 2019

This teacher’s aide joined march downtown today #LAUSDstrike pic.twitter.com/pitAGt53Uh — Priska Neely (@priskaneely) January 14, 2019

#LAUSDStrike: If we can handle classes of 49, we can handle rain. pic.twitter.com/nFRlGcbEua — It's All Good (@godfreyland) January 14, 2019

Proud to support LA teachers, students, & families today at the @UTLAnow strike. As a product of LAUSD education, I know firsthand the need for smaller class sizes & greater value+compensation for teachers, among much else. Our students and teachers deserve better schools! pic.twitter.com/KuQkRMDbkX — Janel Pineda (@Pineda_Janel) January 14, 2019

TEACHERS' STRIKE: Los Angeles teachers protest in the rain as they begin their strike over wages, class sizes and headcount with the district #LAUSDStrike pic.twitter.com/VJSe6kFkgZ — TicToc by Bloomberg (@tictoc) January 14, 2019

Over 85 % of schools reporting. 28,000 @utlanow members on the picket lines in LA; Beutner says 3000- that means he is really bad at math.. no wonder he doesn’t understand LA schools finances #UTLAstrong #RedForEd #wearela #LAUSDStrike pic.twitter.com/gkJqNvMIbl — Randi Weingarten (@rweingarten) January 14, 2019

Our Northeast LA (NELo) Local members fanned out across six different schools—Dorris Day, Sotomayor, Eagle Rock HS, Buchanan Street Elementary, Meridian EEC and Nightingale—in support of @UTLAnow. Whose schools? OUR SCHOOLS! #UTLAStrong #UTLAStrike #LAUSDStrike pic.twitter.com/zY0CEdqEEC — LA Tenants Union (@LATenantsUnion) January 14, 2019

Honored to be in solidarity with teachers of Loreto Elementary School. You work so hard and give so much for the future of LA. #LAUSDStrike #teachersstrike #1u pic.twitter.com/FiYWNI2ydE — Kevin de Leόn (@kdeleon) January 14, 2019

Leighton Milton, a 21-year district veteran who teaches at Hollywood High, said he’s had as many as 55 students in one class and now has one with 42.

“It’s really hard to connect and to deal with 50 people,” he said as he headed to the march.

Months of talks between United Teachers Los Angeles, which has 35,000 members, and the district have ended without a deal. Beutner said the district is committed to resolving the contract negotiation as soon as possible and urged the union to resume bargaining.

“We made our last proposal to UTLA on Friday which was rejected. They walked away from bargaining,” he said, adding that he was talking with the governor, mayor and the state superintendent of public education but didn’t release details.

The union rejected that district offer to hire nearly 1,200 teachers, counselors, nurses and librarians and reduce class sizes by two students. It also included a previously proposed a 6 percent raise over the first two years of a three-year contract. The union wants a 6.5 percent hike at the start of a two-year contract.

Teachers earn between $44,000 and $86,000 a year depending on their education and experience, according to the Los Angeles County Office of Education. The district says the average teacher salary is $75,000, which reflects an older, more experienced workforce.

Teachers also want significantly smaller class sizes, which routinely top 30 students, and more nurses, librarians and counselors to “fully staff” the district’s campuses in Los Angeles and all or parts of 31 smaller cities, plus several unincorporated areas.

The district says the demands run up against an expected half-billion-dollar deficit this budget year and billions that are obligated for pension payments and health coverage for retired teachers.

The union argues that the district is hoarding reserves of $1.8 billion that could be used to fund the pay and staffing hikes. The district said that money is needed to cover retiree benefits and other expenses.

Teachers are trying to tap into the “Red4Ed” movement that began last year and won big raises even in states with “right to work” laws that limit the ability to strike. They started in West Virginia, Oklahoma, Kentucky and Arizona and moved to Colorado and Washington state.

Los Angeles union officials say those walkouts moved them to act.

The union says Beutner and school board members who voted him in are trying to privatize the district. It says they are encouraging school closures and flipping public schools into charters, which are privately operated public schools that compete for students and the funds they bring in.

Beutner, an investment banker and former Los Angeles deputy mayor without experience in education, has said his plan to reorganize the district would improve services to students and families. He and his supporters on the board envision an education system with public and charter schools under the same leadership.