She decided to examine the trucks. There were four of them, all covered trucks. Shining her torch, she climbed up into one of them, pulling Timmy up behind her. She expected to find it quite empty, unloaded many, many years ago by long-forgotten railwaymen.

But it was loaded with boxes! George was surprised. Why did a spook-train run about with boxes in it? She shone her torch on to one — and then quickly switched it out!

She had heard a noise in the tunnel. She crouched down in the truck, put her hand on Timmy’s collar, and listened. Timmy listened, too, the hackles rising on his neck.

It was a clanging noise. Then there came a bang. Then a light shone out, and the tunnel was suddenly as bright as day!

The light came from a great lamp in the side of the tunnel. George peeped cautiously out through a crack in the truck. She saw that this place must be where the tunnel forked. One fork went on to Kilty Yard — but surely the other fork was supposed to be bricked up? George followed the lines with her eyes. One set went on down the tunnel to Kilty Yard, the other set ran straight into a great wall, which was built across the second tunnel, that once led to Roker’s Yard.

“Yes — it is bricked up, just as the old porter told Julian,” said George to herself. And then she stared in the greatest amazement, clutching the side of the truck, hardly believing her eyes.

Part of the wall was opening before her! Before her very eyes, a great mass of it slid back in the centre of the wall — back and back and back — until a queer-shaped opening, about the size of the train itself, showed in the thick wall. George gasped. Whatever could be happening?

A man came through the opening. George felt sure she had seen him before somewhere. He came up to the engine of the train and swung himself into the cab.

There were all sort of sounds then from the cab. What was the man doing? Starting the fire to run the train? George did not dare to try and see. She was trembling now, and Timmy pressed himself against her to comfort her.

Then came another set of noises — steam noises. The man must be going to start the engine moving. Smoke came from the funnel. More noises, and some clanks and clangs.

It suddenly occurred to George that the man might be going to take the train through that little opening in the bricked-up wall. Then — supposing he shut the wall up again — George would be a prisoner! She would be in the truck, hidden behind that wall, and the wall would be closed so that she couldn’t escape.

“I must get out before it’s too late,” thought George, in a panic. “I only hope the man doesn’t see me!”