He knew that Plum nor Pedro could not uncouple the car as long as they were climbing the upgrade, but immediately beyond the bend a descent was made into the valley.
He was rapidly approaching the summit, when he made a discovery which sent a thrill of horror through his frame.
Not a hundred yards ahead lay on the right hand rail a huge bowlder!
That the bush-raiders had put it there to wreck the train he had no doubt.
Just then the train gave a sharp lurch, and the reports of firearms pealed above the din of the moving train.
Instantly the bell cord was pulled vigorously three or four times.
Plum Plucky was in trouble.
Chapter XVI
The Attack on the Train
The firing from the rear increased, but Jack had enough to attend to without giving it a second thought.