I-25 enters Wyoming 8 miles south of the state capital, Cheyenne. After traveling through downtown, the interstate continues north to Douglas, Wyoming, passing many plateaus and train tracks. Commonly, very long trains can be seen slowing moving beside the interstate. Around Douglas, the interstate curves to the west towards Casper. Once in downtown Casper, I-25 sharply turns north and continues to Buffalo, where it merges with I-90 and ends.