But even as they gazed the cloud seemed to sink like a fairy mirage to the earth again, the whole train disappeared, and only the empty stretching track returned.

They did not know that this seemingly flat and level plain was really undulatory, and that the vanished train had simply dipped below their view on some further slope even as it had once before.

But they knew they were disappointed, and that disappointment revealed to them the fact that they had concealed it from each other.
The girl was the first to succumb, and burst into a quick spasm of angry tears.

That single act of weakness called out the boy's pride and strength.

There was no longer an equality of suffering; he had become her protector; he felt himself responsible for both.