XV. The Dude Operator 246
XVI. A Dramatic Flagging 262
XVII. Wilson Again Distinguishes Himself 279
XVIII. With The Construction Train 295
XIX. The Enemy's Hand Again, And A Capture 310
XX. A Prisoner 325
XXI. Turning The Tables 337
XXII. The Defense Of The Viaduct 357

ILLUSTRATIONS

PAGE

The next moment the Midway Junction ghost stepped
grimly from his box. Frontispiece

"Now I am going to cut your cords," Alex went on
softly. 8

Held it over the bull's-eye, alternately covering and
uncovering the stream of light. 13

Threw himself at the front door, pounding upon it
with his fists. 26

In the middle of the floor, the center of all eyes,
hurriedly working with chisel and hammer. 31

He was gazing into the barrel of a revolver. 54

But the response click did not come. 59

The clerk was colorless, but only faltered an instant. 72

"There!" said Jack, pointing in triumph. 77

Looped it over the topmost strand, near one of the posts. 86

There, in the corner of the big barn, Jack sent as he
had never sent before. 91

With a rush they dashed into the wall of smoke. 98

Closer came the roaring monster. 103

"Come on! Come on!" exclaimed the man in the
doorway. 112

"How did you do it, Smarty?" snapped the shorter man. 117

They whirled by, and the rest was lost. 140

The engineer stepped down from his cab to grasp Alex's
hand. 143

The wait was not long. 146

Jack made out a thin, clean-shaven face bending over
a dark-lantern. 159

The stranger drew the