I don't know if a subscriber link will work, so I copy/pasted the short article below.
From this morning's Spokesman-review: Link

23-car derailment shuts down line

SEATTLE – The Union Pacific line that runs through Eastern Washington has been shut down since Friday by a 23-car derailment that included a hazardous cargo spill of sodium chlorate and subsequent fire that flared over the weekend.

No one was injured in the Friday incident that Union Pacific reports was triggered by a rock slide and left 11 of the 23 cars derailed inside a tunnel near Ritzville, the Seattle Times reported.

The spill of sodium chlorate, a crystalline chemical used in bleaching paper pulp, happened in one train car that derailed outside the tunnel. The state Department of Ecology said the spill and fire, the intensity of which was increased by the chemical, occurred in a remote area.

Union Pacific still has no estimated time for reopening the railroad line, which runs from the Canadian border to the Columbia River Gorge, and trains have been rerouted along a line operated by the BNSF Railway.

From staff and wire reports