He walked about a mile across town until he came to the limits crossing, and stood in the shelter of a flagman’s shanty for a few minutes. Then a sharp whistle greeted his ears. He strained his vision and made out a dim form loitering near a big heap of ties.

“Mr. Glidden?” spoke Ralph, advancing to meet this man.

“That’s what,” responded Glidden, in his usually snappy way. “All ready?”

“Yes.”

“It’s all arranged. The regular men have been called off for the night. You take the relay station, and I’ll be on duty at the tower station beyond, catching the messages that fly over the wires, and see if we can’t nail the people who are making the Great Northern all this trouble.”

[CHAPTER XII—AT THE RELAY STATION]

The relay station was located just beyond the limits of Stanley Junction, and was practically the feeder through which ran all the railroad and commercial wires focussing at headquarters. It stood in a wide triangle formed by the tracks of the three divisions of the road, which here branched out north, south and west.

The station was the top of a sort of wareroom for all kinds of railroad junk. Stairs led up to it both inside and outside. Over the tower roof, reached by a trap door, was the great enclosed network of wires covering all the lines of the Great Northern.

Ralph had talked affairs over so closely with the superintendent and later with Glidden, that as he left the latter he knew just what he was expected to do and how he was to do it. His mission was one of great importance and of secrecy as well, for the relay station and the first switch tower on the southern branch less than a quarter of a mile beyond it, were suspected points in the train dispatching service just now.

Ralph left Glidden after a brief whispered conversation. He gained the immediate vicinity of the relay station through slow, cautious progress. He had visited the place the day previous and had studied his ground well. When he at length entered the open doorway, he felt sure that he had reached his goal without attracting the attention of the two occupants of the operating room whom he had made out as he approached.