One end at the metal gate S of Barcroft station and the other end at the fire ring/parking spot at the Trail Canyon/Queen Canyon Saddle. From S to N: Up the road to White Mountain Peak, then cross country north of there. Through the cross-country leg, stay on the crest-top plateau and ridgeline to Montgomery and finally over Boundary Peak to its informal trail down to the Queen Canyon access.  ~30 miles.  Very long drive for the shuttle.