"My!" cried Phineas, simulating a snort of indignation; "I never did come across such a curious chap in all my born days. I began to think that you'd stick in the place, grow to it as the saying is. But there, I don't blame any youngster for liking a big works same as this. There's so much to see, huge lathes and planing machines running and doing their work as if they were alive and thinking things out. Steam-hammers thudding down on masses of red-hot metal, giving a blow that would crack a house and smash it to pieces, or one that would as easily fracture a nut. Then there are the furnaces and the foundry: guess all that's interesting. But you've got more to see; it's time we made way up for Culebra. Look here, boy, set her going, and mind you watch the spoil trains." The precaution and the warning were necessary, for the double track of the Panama railway at this point was much occupied by the long trains of cars filled with earth coming from the trench that was being cut through the high ground just ahead. It was not until they actually reached the neighbourhood of Culebra, which may be said to occupy a place in the centre of the gigantic cut, that Jim gathered a full impression of the work, or the reason for so many freight cars. But it was true enough that the driver of the motor truck had to keep his wits about him to escape collision; for every three minutes a spoil train came along, dragged perhaps by a locomotive made at Gorgona, or by one imported by the French, and of Belgian manufacture. Every three minutes, on the average, a train came puffing down the incline from Culebra, and nothing was allowed to delay it. In consequence, the motor inspection car on which Phineas and his young friend were journeying was compelled at times to beat a hasty retreat, or to go ahead at full power before an advancing empty train--returning from the great dam at Gatun, where it had deposited its load--till it arrived at a point where a switch was located. There was nearly always a man there, and promptly the car was sidetracked. "It's the only way to do the business," explained Phineas. "The getting away of those spoil trains means the success of our working. If they don't get clear, so as to be back at the earliest moment, there's going to be any number of steam diggers thrown out of work; for it's no use shovelling dirt if there aren't cars to load the stuff in. If there's a breakdown with one of the cars, guess the whole labour force is pushed on to it, so as to get the lines clear. Telephone wires run up and down the line, and a breakdown is at once reported. But we're just entering the cut, and in a little while you'll be able to see and understand everything."