It was a curious study for a thoughtful observer, this motley crowd of human beings sinking all differences of race, creed, and habits in the common purpose to move westward--to the mountain fastnesses, the sage-brush deserts and the Golden Gate. The warning bell had sounded, and the fireman leaned far out for the signal. The gong struck sharply the conductor shouted, "All aboard," and raised his hand; the tired ticket-seller shut his window, and the train moved out of the station, gathered way as it cleared the outskirts of the town, rounded a curve, entered on an absolutely straight line, and, with one long whistle from the engine, settled down to its work. Through the night hours it sped on, past lonely ranches and infrequent stations, by and across shallow streams fringed with cottonwood trees, over the greenish-yellow buffalo grass near the old trail where many a poor emigrant, many a bold frontiersman, many a brave soldier, had laid his bones but a short time before. Familiar as they may be, there is something strangely impressive about all-night journeys by rail, and those forming part of an American transcontinental trip are almost weird. From the windows of a night express in Europe or the older portions of the United States, one looks on houses and lights, cultivated fields, fences, and hedges; and, hurled as he may be through the darkness, he has a sense of companionship and semi-security. Far different is it when the long train is running over those two rails which, seen before night set in, seem to meet on the horizon. Within all is as if between two great seaboard cities; the neatly dressed people, the uniformed officials, the handsome fittings, the various appliances for comfort. Without are now long dreary levels, now deep and wild canyons, now an environment of strange and grotesque rock-formations, castles, battlements, churches, statues. The antelope fleetly runs, and the coyote skulks away from the track, and the gray wolf howls afar off. It is for all the world, to one's fancy, as if a bit of civilization, a family or community, its belongings and surroundings complete, were flying through regions barbarous and inhospitable.