Köln-Mindener Eisenbahn-Gesellschaft
In Wiesbaden the Nassau state railway connected with the Taunus Railway from Frankfurt to Wiesbaden, opened in 1839 and 1840. At the end of the Lahn Valley line in Wetzlar, it connected with the Deutz-Giessen line completed in 1862 by the Cologne-Minden Railway Company ("Cöln-Mindener Eisenbahn").