Rube Foster resided in Hot Springs, AR around the turn of the century, as did several other well-know Negro leaguers1. He practiced alongside Connie Mack's Philadelphia Athletics, who were training in Hot Springs at the time. He may also have pitched with the Hot Springs Arlingtons2. Meanwhile, he found employment at a restaurant1.
Foster was elected to the Baseball Hall of Fame in 1981. He died December 9th, 1930 in Kankakee, Illinois.
"Some well-known players who have played with the Arlingtons of this city [Hot Springs] are: . . . Rube Foster."2
"About the time the American league was born Rube blew into Hot Springs, Ark., where Connie Mack was putting his Athletics through spring training. Foster found employment in a restaurant, and spent his spare time pitching to Mack’s backstops. When the Athletics struck camp, Mack sent Rube to the Philadelphia Royal Giants, with which aggregation the ebony-skinned tosser played several seasons."1
Statistics at Baseball-Reference.com.
1. Philadelphia Inquirer, 12/2/1912
2. "Notes on the Game", David Wyatt, Freeman (Indianapolis), 2/5/1910