Associated Press - November 20, 2009 5:55 PM ET

CHEYENNE, Wyo. (AP) - The state of Wyoming has filed a new federal lawsuit seeking to block the National Park Service from restricting snowmobile numbers in Yellowstone National Park.

The Park Service on Friday issued a temporary rule that would allow up to 318 snowmobiles and 78 snowcoaches per day into the park starting next month and continuing through next winter.

The Park Service had allowed up to 720 snowmobiles a day into the park over the past five winters, but actual use has been far less.

Wyoming filed a lawsuit in federal court on Friday seeking a court order to reinstate the higher limits until the Park Service adopts an acceptable permanent rule.

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