After quieting Juniper, and having the satisfaction of seeing him begin to eat hay quite as though he were in his own stable, Rod left the car and followed his railroad friends in order to learn something about getting a train ready for its run.  He found them walking on opposite sides of it, examining each car by the light of their lanterns, and calling to each other the inscriptions on the little leaden seals by which the doors were fastened.  These told where the cars came from, which information, together with the car numbers, and the initials showing to what road they belonged, Conductor Tobin jotted down in his train-book.  He also compared it with similar information noted on certain brown cards, about as wide and twice as long as ordinary playing-cards, a package of which he carried in his hand.  The destinations of the several cars could also be learned from these cards, which are called “running slips.”  Each car in the train was represented by one of them, which would accompany it wherever it went, being handed from one conductor to another, until its final destination was reached.

At length, about ten o’clock, through Freight Number 73, to which car number 1160 was attached, received its “clearance,” or order to start, from the train-dispatcher, and began to move heavily out from the yard, on to the main west-bound track.  Juniper now did not seem to mind the motion of the car in the least; but continued quietly eating his hay as though he had been a railroad traveller all his life.  So Rod, who had watched him a little anxiously at first, had nothing to do but stand at the open door of his car and gaze at what scenery the darkness disclosed.  Now that he was beginning to comprehend their use, he was deeply interested in the bright red, green, and white lights of the semaphore signals that guarded every switch and siding.  He knew that at night a white light displayed from the top of a post, or swung across the track in the form of a lantern, meant safety, a red light meant danger, and a green light meant caution.  If it had been daytime he would have seen thin wooden blades, about four feet long by six inches wide, pivoted near the top of the same posts that now displayed the lights.  He would have learned that when these stretched out horizontally over the track, their warning colors must be regarded by every engineman; while if they hung down at an angle, no attention need be paid to them.

Being a very observant boy, as well as keenly interested in everything to be seen on a railroad, Rod soon discovered that the semaphore lights also appeared at intervals of a few miles along the track, at places where there were no switches, and that these always moved as soon as the train passed them.  He afterwards discovered that these guarded the ends of the five-mile blocks, into which the road was divided along its entire length.  Each of the stations, at these points, is occupied by a telegraph operator who, as soon as the train enters his block, displays a red danger signal behind it.  This forbids any other train to enter the block, on that track, until he receives word from the operator at the other end of the block that the first train has passed out of it.  Then he changes his signal from red to white, as a notice that the block is free for the admission of the next train.  This “block system,” as it is called, which is now in use on all principal railroad lines, renders travel over them very much safer than it used to be before the system was devised.

After watching the semaphore lights for some time, and after assuring himself that Juniper was riding comfortably, Rod spread a blanket, that Brakeman Joe had loaned him, over a pile of loose hay, placed his M. I. P. bag for a pillow, and in a few minutes was sleeping on this rude bed as soundly as though he were at home.

Some hours later the long, heavily laden train stopped at the foot of the steep grade just east of Euston, and was cut in two in order that half of it might be drawn to the top at a time.  Rear Brakeman Joe was left to guard the part of the train that remained behind, and he did this by walking back a few hundred yards along the track, and placing a torpedo on top of one of the rails.  Then he went back as much farther and placed two torpedoes, one a rail’s length behind the other.

These railroad torpedoes are small, round tin boxes, about the size of a silver dollar, filled with percussion powder.  To each is attached two little straps of lead, which are bent under the upper part of the rail to hold the torpedo in position.  When it is struck by the ponderous wheels of a locomotive, it explodes with the sound of a cannon cracker.  The explosion of two torpedoes, one directly after the other, is the signal for caution, and bids the engineman proceed slowly, keeping a sharp lookout for danger.  The explosion of a single torpedo is the signal of immediate danger, and bids him stop his train as quickly as possible.  Thus Brakeman Joe had protected his train by arranging a cautionary signal, which would be followed immediately by that of danger.  Before his train started again he intended to take up the single torpedo, leaving only those calling for caution, to show that the freight had been delayed.  In the meantime he decided to walk back to the cars left in his charge and see that no one was meddling with them.

Rod was too soundly asleep to know anything of all this, nor did he know when an ugly-looking fellow peered cautiously into his car, and said, in a low tone:  “This here ain’t it.  It must be the one ahead.”  The first thing of which he was conscious was hearing, as in a dream, the sound of blows, mingled with shouts, and a pistol shot, and then Brakeman Joe’s voice calling:  “Rod!  Rod Blake!  Help! quick!”

An instant later the boy had leaped from the car, and was by his friend’s side, engaged in a desperate struggle with four as villainous-looking tramps as could well be found; though, of course, he could not judge of their appearance in the darkness.  Joe was wielding the heavy oak stick that at other times he used as a lever to aid him in twisting the brake wheels; but Rod was obliged to depend entirely on his fists.  The skill with which he used these was evidently a surprise to the big fellow who rushed at him, only to receive a stinging blow in the face, which was followed by others delivered with equal promptness and effect.  There were a few minutes of fierce but confused fighting.  Then, all at once, Rod found himself standing alone beside a car the door of which was half-way open.  Two of the tramps had mysteriously disappeared; he himself had sent a third staggering backward down the bank into a clump of bushes, and he could hear Brakeman Joe chasing the fourth down the track.

A few minutes later the locomotive came back, sounding four long blasts and one short one on its whistle, as a recall signal for the rear flagman.  It was coupled on, and some one waved a lantern, with an up-and-down motion, from the rear of the train, as a signal to go ahead.  The engineman opened the throttle, and the great driving wheels spun round furiously; but the train refused to move.  He sounded two long whistle blasts as a signal to throw off brakes.  Then a lantern was seen moving over the tops of the cars, the brakes that had been holding them, were loosened, and the signal to go ahead was again waved.  After this the lantern disappeared as though it had been taken into the caboose, and the train moved on.

Its severed parts were re-united at the top of the grade, and it passed on out of the block in which all these events had taken place, before Conductor Tobin, who had wondered somewhat at not seeing Brakeman Joe, discovered that the faithful fellow was missing.  He was not on top of any of the cars, nor in the caboose, and must have been left behind.  Well, it was too late to stop for him now.  Freight Number 73 must side-track at the next station, to allow the night express to pass, and it had already been so delayed, that there was no time to lose.

When the station was reached, and Conductor Tobin had seen his train safely side-tracked, he went to look for Rod Blake.  He meant to ask the boy to take Brakeman Joe’s place for the rest of the run, or until that individual should rejoin them by coming ahead on some faster train.  To his surprise the young stockman was not in car number 1160, nor could a trace of him be found.  He, too, had disappeared and the conductor began to feel somewhat alarmed, as well as puzzled, by such a curious and unaccountable state of affairs.