I also did some looking at the 1880 census and this could be your Alfred. He's old enough that he may have been married before he married Dolly. The occupation of R.R. Engineer seems too much of a coincidence. The age of Alfred on the 1880 matches his age on the 1910 census.
1880 OH Washington Co., 1st Ward Marietta Alfred Ault age 27 R.R. Engineer, b. OH, father b. Bavaria, mother b. OH Ella wife age 23 b. OH, OH, OH Holmes age 2 b. OH Cary age 1 b. OH