"I won't," Allan promised, still laughing. "I'll always speak to you, if I happen to think of it." "Let me give you one piece of advice," went on Marney, with sudden earnestness. "You'll be knockin around these yards more or less now, all th' time, an' if ye want t' live t' be suprintindint, you've got t' kape your eyes open. Now moind this: when you're crossin' th' yards, niver think of anything but gittin' acrost; niver step on a track without lookin' both ways t' see if anything's comin; an' if anything _is_ comin' an' you're at all doubtful of bein' able t' git acrost ahead of it at an ordinary walk, don't try. Give it th' right o' way. I've been workin' in these yards goin' on forty year, an' I've managed t' kape all my arms an' legs with me by allers rememberin' that rule. Th' boys used t' laugh at me, but them that started in when I did are ayther sleepin' in th' cimitery, or limpin' around on one leg, or eatin' with one hand. A railroad yard is about th' nearest approach to a human slaughter-house there is on this earth. Don't you be one o' th' victims." "I'll certainly try not to," Allan assured him, and went out with a livelier sense of the dangers of the yard than he had ever had before; and, indeed, the yardmaster had not overstated them, though the crushing and maiming and killing which went on there were due in no small degree to the carelessness and foolhardiness of the men, who grew familiar with danger and contemptuous of it from looking it every day in the face, and took chances which sooner or later ended in disaster. The person Allan had next to find was the master-mechanic, whose office was a square, one-storied building behind the great shops which closed in the lower end of the yards. He knew the shops thoroughly, for he had been through them more than once under Jack Welsh's guidance, and had spent many of his spare moments there, for there was a tremendous fascination about the intricate and mammoth machinery which filled them, almost human in its intelligence, and with which so many remarkable things were accomplished. So on he went, past the great roundhouse where stood the mighty engines groomed ready for the race, or being rubbed down by the grimed and sweaty hostlers after a hundred-mile run; past the little shanty with "21" in big figures on its door--headquarters of Section Twenty-One, and receptacle for hand-car and tools,--the hand-car which he had pumped along the track so many times, the tools with which his hands had grown familiar. The door of the "long-shop" lay just beyond, and he entered it, for the shortest path to the master-mechanic's office lay through the shops; and Allan knew that he would probably find the official he was seeking somewhere among them, inspecting some piece of machinery, or overseeing some important bit of work.