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Born in Grove Oak, Alabama, Rains attended the public schools, Snead Seminary, Boaz, Alabama, State Teachers College (now Jacksonville State University), Jacksonville, Alabama, and the University of Alabama at Tuscaloosa. He studied law, was admitted to the bar in 1928 and commenced practice in Gadsden, Alabama, in 1929. He served as deputy solicitor for Etowah County, Alabama from 1930 to 1935, and as city attorney for the city of Gadsden, Alabama from 1935 to 1944. He served as a member of the Alabama House of Representatives 1941-1944.
Rains was elected as a Democrat to the Seventy-ninth and to the nine succeeding Congresses (January 3, 1945-January 3, 1965). In 1957, he voted against H.R. 6127, Civil Rights Act of 1957.  He was not a candidate for renomination to the Eighty-ninth Congress. He served as chairman of board, First City National Bank (later First Alabama Bank of Gadsden) until becoming chairman emeritus in 1979. He was a resident of Gadsden, Alabama, until his death there on March 22, 1991.
This article incorporates public domain material from websites or documents of the Biographical Directory of the United States Congress.