The lawsuit, filed in federal court, further escalates the clash between California and the Trump administration over the bullet train project.
The city of San Francisco sued over the regulation on May 2, hours after President Trump announced it.
It’s an alternative to conventional burial and cremation that produces topsoil suitable for gardening.
The transit hub bustles with 36 million visitors a year. But unlike in the nation’s capital — and in cities such as Denver and New York — L.A.’s Union Station has yet to become a central destination.