Just across the border in the state of Chihuahua, Cerocahui is a quiet mountain village set amid towering pines. It's a 40-minute drive along a bumpy, mostly unpaved road from the train station at Bahuichivo. (Your hotel will send someone to pick you up.) Cerocahui is a favorite stop for birders—more than 200 species of birds have been spotted in this part of the Sierras.