Once more they walked carefully toward the other end of the freight car, whither the pussy had gone. But again the furry animal dashed between Bunny and his sister, keeping out of reach of their eager hands.

"I don't b'lieve it wants us to catch him," said Sue.

"I don't b'lieve so, either," agreed Bunny.

But they did not give up trying, though the more they raced after the little pussy the livelier that animal seemed to become, until Bunny and Sue were getting quite tired.

Then, suddenly, when they were in one end of the car trying to corner the lively little cat, there came a jar and a jolt to the car.

"What's that?" asked Sue, a bit frightened.

"Something bumped into us," Bunny answered. "I guess maybe it was the engine." Then, as the children felt another bump, which shook the whole car and them also, and as they heard a banging noise and the tooting of a whistle, Bunny exclaimed: "Oh, an engine is hitching on our car! We're going to have a ride!"

Before Sue could say anything the car suddenly became dark, for the sliding door on the side, by which Bunny and his sister had entered, slid shut with another bang.

"Oh, Bunny!" cried Sue, this time in great fright. "We're shut in here!"

"Yes," agreed Bunny, trying hard to be brave and not cry as he felt Sue was going to do. "I guess we are!"