rolled slowly over the rails, for the ground was a little uphill. Then
they came to a part that was downhill.

"Now see 'em go!" cried Bunny in delight.

"They're going awful fast!" cried Sue. "You'd better look out!"

"This is an express train," explained Bunny. "Express trains are very
fast."

Indeed the toy locomotive did seem to be going very fast. It rocked and
swayed on the tin rails, and it was soon near the end of the line where
there was a curve.

And there is where the accident happened. The curve was so sharp, and
the electric engine was going so fast, that, instead of turning around,
it kept on straight, jumped over the rails and began to run down hill on
the dirt and stone path that led to the lake.

"Oh!" gasped Sue.

"Oh, my!" cried Bunny, and then, before Sue could stop him, her brother
ran to the edge of the hill. He saw his toy engine and cars rolling over
and over toward the lake at the bottom of the hill, and, without
stopping a second, over the hill went Bunny Brown himself--slipping,
sliding and falling down!

"Oh, Bunny! Come back! Come back!" cried Sue, very much excited.

But Bunny was rolling over and over down the hill after his train, and