Just the moment before the head of the locomotive rammed that seemingly immovable barrier at the end of the siding there flashed into the air from Tom's annunciator the code word agreed upon announcing a wreck, and the number of the sector on which the electric locomotive was then running.

The next moment the crash occurred.

Tom had leaped up with a shout of warning. "Hang on!" was his cry. But when the locomotive had struck and rebounded Ned, from far down the aisle of the locomotive, wanted to know in a very peevish tone what he should have hung on to?

"My elbows!" he groaned. "I've skinned 'em, and my back has got a twist in it like the Irishman thought he had when he put on his overalls hind-side to. What's happened?"

"Bless my radiolite!" growled Mr. Damon. "My watch crystal is broken all to finders, if you want to know. Bless my shock-absorbers! you won't do this locomotive a bit of good, Tom Swift, if you stop it so abruptly."

"And that's the surest word you ever said," responded Tom, hurrying to the door. "I don't know what's broken, but we're still on the rails. The most immediate thing to learn, is the where-abouts of the fellow who did this."

"Who opened the switch?" cried Ned.

"I believe it was Andy O'Malley. Come on, Ned! Koku is after him and I don't want him to tear O'Malley apart before I get there."

"O'Malley has got powerful interests behind him, and it might go hard with Koku if he injured the spy and some of these Westerners caught him," suggested Mr. Damon.

"They ought to thank Koku for manhandling the fellow—if he does," said Ned.