The Prescott and Arizona Central Railroad was the first railroad to reach Prescott, starting from Seligman to the north. This line only lasted several years due to a number of reasons, among them was the fact that is wasn't very well constructed. Proof of this can be seen when one tries to find remnants of the old ROW today....virtually no evidence of its existence can be found, save for the northern-most section in Railroad canyon just south of Seligman.
It serves as the first major abandonment in Arizona.
Thanks to James for contributing information about this route.