The long June day was drawing to its close. Hot and strong the slanting sunbeams beat upon the grimy roofs of the train and threw distorted shadows over the sand and sage-brush that stretched to the far horizon. Dense and choking, from beneath the whirring wheels the dust-clouds rose in tawny billows that enveloped the rearmost coaches and, mingling with the black smoke of the "double-header" engines, rolled away in the dreary wake.