"Is the train in?" asked the manufacturer.
"Will be in a few minutes, so the gateman said," answered Phil.
They saw to it that their trunks were properly cared for, and a short while after the cars came in and they climbed aboard. Seats had been engaged beforehand, so there was no trouble on that score.
"Now remember to write whenever you get the chance," said Oliver Wadsworth to Dave. "And if you run short of funds, don't hesitate to let me know."
"I'll remember, and thank you very much," replied Dave, and then the long train moved off, slowly at first, and then at a good rate of speed. Dave's long journey to solve the mystery of his identity had begun.
"Say, what mountain is this we're goin' under, anyway?" came presently from the sailor. "I noticed it when I came to New York."
"This isn't a mountain," laughed Roger. "It is New York City itself. We are under the streets."
"Great whales! Wonder they don't knock down the wall o' somebuddy's cellar!"
It was not long before they came out into the open, and then both Dave and the sailor looked out of the windows with interest. Phil and Roger were more used to traveling, and spent the time in pointing out objects of interest and in answering questions.
