Time passed, and he sat there motionless, save for the jolting of the train that bumped him this way and that against the brake wheel. They were into the mountains now; and the snowy summits, moon-touched, reared themselves in white, grotesque, fanciful shapes, and seemed, cold in their beauty, to bring an added chill to the frosty night. Ahead, far ahead, the headlight's ray swept now the track, now the gray rock side, now, softly green, a clump of pines, as the right of way curved and twisted and turned; now, slowing up a grade, the heavy, growling bark of the exhaust came with long intervals between, and now, on the level, it was quick as the tattoo of a snare drum, with the short stack belching a myriad fiery sparks insolently skyward in a steady stream; around him was the sweep of the wind, the roar of the train, the pound of the trucks beating the fish-plates, the sway, the jerk, the recovery of the slewing cars, and, curiously, the deep, brooding silence of the mountains, frowning, it seemed, at this sacrilege of noise; behind, showed the yellow glimmer from the caboose, the dark, indistinct outline of a watching figure in the cupola. Suddenly, snatching at the brake wheel to help him up, Bradley sprang erect. From directly underneath his feet came a strange, confused, muffled sound, like a rush of men from one end of the car to the other. Then there broke a perfect bedlam of cries, yells, shouts and screams--and then a revolver shot. In an instant Bradley was scrambling down the ladder to investigate--they could not hear the row, whatever it was, in the caboose--and in another he had kicked the car door open and plunged inside. A faint, bluish haze of smoke undulated in the air, creeping to the roof of the car; and there was the acrid smell of powder--but there was no sign of a fight, no man, killed or wounded, sprawling on the floor. But the twenty men who filled the car were crouched in groups and singly against the car sides; or sat upright in their bunks, their faces white, frightened--only their volubility unchecked, for all screamed and talked and waved their arms at once. They made a rush for Bradley, explaining in half a dozen languages what had happened. Bradley pushed them roughly away from him. "Speak English!" he snapped. "What's wrong here? Can't any of you speak English?" An Italian grabbed his arm and pointed through the door Bradley had left open behind him to the next car forward. "Pietro!" he shouted out wildly. "Gotta da craze--mad--gotta da gun!" "Well, go on!" prodded Bradley. "He's run into the next car. I understand that--but what happened here? Who's Pietro?" But the man's knowledge, like his English, was limited. He did not know much--Pietro was not one of them--Pietro had come only that morning to Big Cloud from the East--Pietro had gone suddenly mad--no man had done anything to make Pietro mad.