reshie thought it would probably
loosen every carefully fastened bolt in his whole structure.

"And what's more," continued the amused and irritated old car, "if you
think all you've got to do is to be pulled around like a fine lady in a
limousine, you are pretty well fooled. Wait till you feel the juice go
through you--just wait--that's all I say."

"What is juice?" groaned No. 793.

But he could get no answer except "Just wait, you will find out soon
enough."

In another minute he had found out. He felt his door pulled open and a
heavy tread come clump, clump, clump down the whole length of him to the
little closet room at the end. There he felt levers pulled and switches
turned. Suddenly the little wire brush underneath him dropped until it
touched the third rail. Z-z-zr-zr-zr-zz-zz--What in the name of all
blazes was happening to him? He tingled in every bolt. He quivered with
fear. "This must be the juice!" Another lever was turned. He leaped
forward on the track, jerking and thumping and creaking.

Then he settled down and it wasn't so bad. The first scare was over. He
did not go to pieces. On the contrary he felt so excited and strong that
he almost told the old thing behind him to take off his brush and let
himself be pulled. But he was afraid of the cross old car. So he
ventured timidly: "Isn't this great? I should like to go flying along in
the sun like this all day."

"In the sun?" snarled his old companion. "Come now, Freshie, can't you
catch on to what you are? You just look your fill at the old sun now for
you won't see him again for some time."

"Why not?" whimpered No. 793.

But he needed no answer. Ahead of him he could see the track sliding
down into a deep hole. The earth closed over him in a queer rounded
arch, all lined with shiny white tiles. At the same moment the lights
all up and down his own ceiling flashed on. He noticed then that he had
a red lantern on his front. He could tell it by the red, glinting
reflections it threw on the tiles as he tore along. Ahead he could see
a great cluster of lights which seemed to be rushing towards him. Of
course he was really rushing towards them, but he was so excited he got
all mixed in his ideas.

"Where are we? And what on earth is that rushing towards us? And why do
we come down here under the ground?" he screamed to the old car behind.

"There's no room for us on top," jerked the old car. "There are a heap
of people in this old city of New Y