A Union Pacific train travels along the Colorado River near Cameo on May 16, 2023. (Chase Woodruff/Colorado Newsline)

Colorado, along with 15 other states, is poised to sue the federal government for ignoring endangered species regulations in a wide range of infrastructure projects on public lands. One of those projects, a controversial proposal to expand an oil shipping facility in Utah, would significantly increase hazardous rail shipments through Colorado.

Phil Weiser, Colorado’s attorney general, and the attorneys general of the other states provided in a July 18 letter to Trump administration officials a 60-day notice of their intent to sue. The notice expired last week.

The letter cites violations of the Endangered Species Act it says have occurred in pursuit of an executive order

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