If you define a "subway series" as a World Series in which the American League and National teams both represent the same city, then the 1906 series which pitted the Cubs against the White Sox certainly meets that definition. However while parts of the "L" had already been constructed in 1906, the trains didn't start running underground there until 1943.
1906 was the one … [Read more...] about Cubs White Sox Subway Series
(sort of) – October 9, 1906