This study analyzed the potential transfer effects on reading comprehension skills of two different training programs administered to 9- to 10-year-old children attending fourth grade classes. One training program was based on a working memory updating paradigm (i.e., words, digits, sentence and text updating working memory tasks). The other program was based on metacomprehension activities focused on text structures, genres, text sensitivity, and text comprehension strategies. Performance was compared pre and post training on running memory, text updating, and reading comprehension tasks. The results showed that significant gains were obtained in both text updating and reading comprehension tasks, with a far transfer effect for both types of training. Limited nearest transfer effects suggest that gains could be due to acquisition of effective strategies in both programs, with training suitable for improving written text processing; however, performance did not differ between programs.