How is rationalism versus superstition presented in the story ?Charles Dickens's "The Signal-Man"

An interesting character, the signalman is a combination
of  diligence and superstition. While he calls to the narrator, the narrator believes
him first to be "a spirit."  The signalman returns the dubious look of the narrator,
wondering if he has seen the narrator before, and marveling at what he has heard. Later,
after they become friendly, the signalman asks the narrator if
he

"had no
feeling that they [the narrator's words] were conveyed to you in a supernatural
way?"

The next night, the
signalman confides to the narrator that the previous night he had mistaken the narrator
for "that someone else."  This person puts his left arm across the face and waves
violently with the right arm.  He has heard this man cry, too.  But, the empirical
narrator explains this vision to the signalman,

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...I showed him how that this figure must be a
deception of his sense of sight; and how that figures, originating in diseas ofthe
delicate nerves that minister to the functions of the eye, were know to have often
trouble patients,...and even proved it by experiments upon
themselves.

The narrator
explains the "imaginative cry" as voices in the unnatural valley that play upon the
"wild harp" of the telegraph wires.  The signalman tells the narrator that he has not
finished his tale:

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Within six hours after the Appearance, the
memorable accident on this Line happened, and within ten hours the dead and woounded
were brought along through the tunnel over the spot where the figure had
stood.

Further, he informs
the narrator that this incident occurred about a year ago.  But, six or seven
months  have passed, and one morning in the predawn, he has seen the spectre again. And,
again, the empirical narrator asks him questions.  The signalman says that the ghost
left.

For everything that the signalman says, the narrator
offers a logical explanation.  However, the signalman tells the narrator that he noticed
someone waving hands, and he later learned that a young lady had died in one of the
compartments.  After a week, the spectre returned and resumed his calling out to "Look
out! Look out!"  Convinced of his error, the narrator says that the bell has not rung,
but the man insists that the bell's ring is "a strang
vibration."

After the narrator makes the man look out the
door for the spectre, who is not there, the signal-man asks, "What is the danger?  Where
is the danger?" feeling "some dreadful calamity."  The narrator departs the nervous
signalman, sensing something eerie himself.  Then, the narrator believes that he will
ask a wise practioner about him. 

The next evening, the
narrator takes a stroll, but is taken aback when he sees
the

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"appearance of a man, with his left sleeve across
his eyes passionately waving his right
arm."

Somehow, the signalman
had not heard the train and has been killed. The strange supernatural warnings were for
the signalman.  Most shaken by the death of his new friend and the nature of the
accident as exactly as described by the signalman, the narrator abandons his
rational thought when he is told by the engineer that he hears the words that the
signalman has mentioned as well as the words which the narrator has "attached, and that
only in my own mind, to the gesticulation he had
imitated."

Somehow, these supernatural incidents have
happened.  With the train's having disturbed nature with the carving of the hill,
supernatural forces have been unleashed and set in motion, too strong to be
controlled.