"I know," said Lidgerwood patiently, and the trainmaster gave it up.

It was an hour or two later in the same day when McCloskey came into the private office again, hat tilted to nose, and the gargoyle face portraying fresh soul agonies.

"They've taken to pillaging now!" he burst out. "The 316, that new saddle-tank shifting-engine, has disappeared. I saw Broderick using the '95, and when I asked him why, he said he couldn't find the '16."

"Couldn't find it?" echoed Lidgerwood.

"No; nor I can't, either. It's nowhere in the yards, the roundhouse, or back shop, and none of Gridley's foremen know anything about it. I've had Callahan wire east and west, and if they're all telling the truth, nobody has seen it or heard of it."

"Where was it, at last accounts?"

"Standing on the coal track under chute number three, where the night crew left it at midnight, or thereabouts."

"But certainly somebody must know where it has gone," said Lidgerwood.

"Yes; and by grapples! I think I know who the somebody is."

"Who is it?"