It was a train of five cars, each about forty feet long, and of circular construction. It rested upon innumerable little runners, and was set quite close to the ground. The end of each car was a huge circular disc of a diameter a little greater than that of the car, and having an elliptical opening of some seven feet in the long diameter. Along each side of the cars was another set of runners, while two more sets were upon the tops. There were no windows to the cars, and they looked plain iron cylinders of vast size, set upon a lot of little iron legs. Standing there a moment, Cobb watched the last passenger leave the hall, and soon heard the guard cry for the gates to be closed. Almost immediately the gate of that compartment was dropped, and he saw the huge train sink into the opening and disappear from sight. Turning toward Rawolle, who had been watching him with a curious expression, he exclaimed: "Rawolle, tell me what kind of transportation is this that I have just seen? It is something that beats my time, and I am at a loss to understand its working." "I do not wonder at your expression of astonishment, my dear boy;" then pointing toward the third opening, and looking at his watch, he continued: "You will see a similar train soon come up; watch carefully." Cobb did as directed, and in a moment saw a train of cars, in all respects similar to the train which he had seen disappear through the left-hand slot, rise from below. It came up gradually, and at last stood, as its mate had stood, flush with the floor of the room; but, unlike the former, it had no passengers to disembark. There it stood, silent and empty. As the train reached the level, a placard was dropped from the top of the gate, bearing the words "Omaha, 16 D.," in large letters. "That is our train, Cobb," said Rawolle, following the eyes of the other to the sign. "Let us get our traps together and get aboard." Approaching the gate, which had by this time been thrown open, and through which many people were passing, Rawolle showed the tickets, and the three men passed in and proceeded along the train to the second carriage. Curbing his impatience to learn more of his peculiar surroundings, Cobb followed Rawolle and Lyman into the car. The car resembled the sleepers of former years, except that it was decorated in a grander style and had no windows. It was lighted by electric lamps, which made it as bright as day. The seats were somewhat differently constructed from those of the old kind, but the general appearance of the interior was quite the same. A porter met them at the door, and after seeing their tickets, showed them to their section. Throwing down his grip and coat, Rawolle said: "Come, Cobb, there are a few minutes before the train leaves; let me show you about." "All right; I am at your service."