Rafael Palmeiro has signed to play for the independent Cleburne Railroaders at age 53, nearly 13 years after his last major league game. The second-year American Association team announced the deal Wednesday. The Railroaders also signed Palmeiro’s 28-year-old son, Patrick, who has played for other independent teams the past three seasons. Palmeiro said in a statement issued by the team that he was “especially excited to get to do this with my son Patrick.” It was not clear exactly how much the elder Palmeiro will play or what his role will be for the Railroaders.