Railey attended Beaverton High School where he averaged 13.9 points and 7.7 rebounds per game while leading the state of Oregon with 111 blocked shots as the team advanced to the second round of playoffs.
[1][2] Railey began his college career at Iowa State where he averaged 0.5 points and 0.7 rebounds a game in 3.5 minutes of action as a sophomore.
[1] On 2012, he transferred to Washington State where he, after sitting out a year per NCAA rules, averaged 6.6 points and 3.2 rebounds as a senior ending as the 16th all-time leader in blocked shots in school history with 62.
[8] On November 14, he made his professional debut in a 113–101 loss to the Grand Rapids Drive, recording two points and four rebounds in 10 minutes off the bench.
[11] The son of Corey and nurse Kim Spaulding, Railey has a younger brother, Darius, who played for Bryant University.