wWhat sort of person was signal-man?

The Signal-Man was nervous, responsible, dedicated to his job, educated, and complacent.

One would have thought, considering the nature of the ground, that he could not have doubted from what quarter the voice came; but, instead of looking up to where I stood on the top of the steep cutting nearly over his head, he turned himself about and looked down the Line. There was something remarkable in his manner of doing so, though I could not have said, for my life, what.

He directed a most curious look towards the red light near the tunnel's mouth, and looked all about it, as if something were missing from it, and then looked at me.

He replied to my remarks with readiness, and in well-chosen words.

He had been, when young (if I could believe it, sitting in that, hut; he scarcely could), a student of natural philosophy, and had attended lectures.

'I believe I used to be so,' he rejoined, in the low voice in which he had first spoken; 'but I am troubled, sir, I am troubled.'