Ralph sat with his hand on the throttle waiting for the signal to pull out of Boydsville Tracks. Ahead were clear, as he well knew, and his eyes were fixed on three men who had just passed down the platform with a scrutinizing glance at the locomotive and its crew. Fogg had watched them for some few minutes with an ominous eye. He had snorted in his characteristic, suspicious way, as the trio lounged around the end of the little depot. "Good day," he now said with fine sarcasm in his tone, "hope I see you again--know I'll see you again. They're up to tricks, Fairbanks, and don't you forget it." "Gone, have they?" piped in a new voice, and a brakeman craned his neck from his position on the reverse step of the locomotive. "Say, who are they, anyway?" "Do you know?" inquired the fireman, facing the intruder sharply. "I'd like to. They got on three stations back. The conductor spotted them as odd fish from the start. Two of them are disguised, that's sure--the mustache of one of them went sideways. The old man, the mild-looking, placid old gentleman they had in tow, is a telegrapher." "How do you know that?" asked Ralph, becoming interested. "That's easy. I caught him strumming on the car window sill, and I have had an apprenticeship in the wire line long enough to guess what he was tapping out. On his mind, see--force of habit and all that. The two with him, though, looked like jail birds." "What struck me," interposed Fogg, "was the way they snooked around the train at the two last stops. They looked us over as if they were planning a holdup." "Yes, and they pumped the train hands dry all about your schedule," declared the brakeman. "Cottoned to me, but I cut them short. Seemed mightily interested in the pay car routine, by the way." "Did, eh," bristled up Fogg. "Say, tell us about that." "Why, you see--There goes the starting signal. See you again." The brakeman dropped back to duty, and the depot and the three men who had caused a brief ripple in the monotony of a routine run were lost in the distance. For a few minutes the fireman had his hands full feeding the fire, and Ralph, eyes, ears and all his senses on the alert, got in perfect touch with throttle, air gauge and exhaust valve. Ralph glanced at the clock and took an easy position on his cushioned seat. Everything was in order for a smooth run to twenty miles away. The Overland Express was on time, as she usually was, and everything was in trim for a safe delivery at terminus. Fogg hustled about. He was a restless, ambitious being, always finding lots to do about cab and tender. His brows were knitted, however, and every once in a while he indulged in a fit of undertoned grumbling. Ralph watched him furtively with a slight smile. He knew that his companion railroader was stirred up about something. The young engineer had come to understand the quirks and turns and moods of his eccentric helper, just as fully as those of his beloved engine.