The Galveston-Houston Electric Railway company operated a line between the two cities from 1911 through 1936. The Houston station was located at Main Street and Texas Avenue, and the Galveston station was located at 21st Street and Post Office Street. (The Handbook of Texas.)
"Front cover, [is part of] Time table effective January, 1912, Galveston-Houston Electric Railway Company." (1912) Special Collections, University of Houston Libraries: http://hdl.handle.net/1911/37008.
Special Collections, University of Houston Libraries