Do not infer that all steel rails grow whiskers; nor is it, as one might suppose, only the old rails that sport them. The youngest rail on the curve may boast as stout a beard as the oldest rail on the tangent, and one just as gray. They flourish, too, in spite of orders; for while whiskers are permitted on engineers and tolerated on conductors, they are never encouraged on rails. Nature, however, provides the whiskers, regardless of discipline, and, what is more, shaves them herself. Their culture depends on conditions. Some months grow better whiskers than others: September is famous for whiskers, while July grows very few. Whiskers will grow on steel rails in the air of a single night; but not every night air will produce whiskers. It takes a high, frosty air, one that stays out late, to make whiskers. Take, for example, the night air of the Black Hills; it is known everywhere among steel rails as a beard tonic. The day's moisture, falling as the sun drops beyond the hills is drawn into feathery, jewelled crystals of frost on the chilly steel, as a glass of ice-water beads in summer shade; and these dewy stalagmites rise in a dainty profusion, until when day peeps into the cañons the track looks like a pair of long white streamers winding up and down the levels. But beware that track. It is a very dangerous track, and its possibilities lie where Samson's lay--in the whiskers. So it lies in early morning, as pretty a death-trap as any flower that ever lured a fly; only, this pitfall waits for engines and trains and men--and sometimes gets them. It waits there on the mountain grades, in an ambush really deadly for an unwary train, until the sun, which is particularly lazy in the fall, peeping over into the cuts, smiles, at length, on the bearded steel as if it were too funny, and the whiskers vanish into thin air. A smooth-faced rail presents no especial dangers; and if trainmen in the Hills had their way, they would never turn a wheel until the sun had done barbering. But despatchers not having to do with them take no account of whiskers. They make only the schedules, and the whiskers make the trouble. To lessen their dangers, engineers always start, up hill or down, with a tankful of sand, and they sand the whiskers. It is rough barbering, but it helps the driver-tires grit a bit into the face of the rail, and in that way hang on. In this emergency a tankful of sand is better than all the air Westinghouse ever stored.