My records show that Samuel Railey b.1777/78 NC d.1850 TN, lived near boundary of Sycamore Creek in Robertson Co TN. He was a brother to my 3rd grgrandfather, Morris Railey b.abt 1794 NC d.1859,bur.Railey Cem.Joelton, Davidson Co TN.
The Samuel of Sycamore Creek was married 1st to Cynthia Marler, they had a daughter (name not known) and a son William Hughey Railey b. 1818, William moved his family from TN to Boone Co AR about 1861.
Samuel md 2nd to Mariah Adcock and they had two daughters.
This information from "The Life & Times of Reglus Walton Raley" by Roger Logan.

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The second Samuel Railey you mention is my grandfather. He was son of Henderson Railey b.19 Feb 1848 Robertson Co Tn d. 24 Sep 1922 Union Co KY and Josephine Railey (his 1st cousin) m. 8 Feb 1871 Davidson Co TN. Josephine Railey b. 27 Feb 1855 Robertson Co TN d. 20 Feb 1917 Union Co KY, both buried Boxville Cem. Union Co KY.

My grandfather Samuel Railey b. 21 Nov 1882 Union Co KY d. 6 Mar 1940 Union Co KY m. Amy Allen Sigler on 9 Mar 1904 Union Co KY, Amy Allen Sigler b. 16 Jul 1885 Union Co KY d. 12 Oct 1975 Union Co KY, both buried Boxville Cem. Union Co KY

The two Samuels you mention have a common ancestor, ROBERT RAILEY b.1755 NC and wife unknown. My line comes through the older Samuel's brother MORRIS RAILEY b.1794 NC d.1859 TN and wife Mary "Polly" Reeder b. abt 1796 VA, both buried in Railey Cem.Joelton, Davidson Co TN.