U-Bahn Line A (Frankfurt U-Bahn)
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The A line is the north-to-south main line of the Frankfurt U-Bahn. It is the oldest and longest line of the U-Bahn system. Served by four routes (U1, U2, U3 and U8) starting at Südbahnhof Railway Station in Sachsenhausen, the A line runs through downtown Frankfurt up to Heddernheim Station in the north of the city, where it branches out to Ginnheim (U1 and U9), Oberursel (U3), Riedberg (U8 and U9) and Bad Homburg (U2). The U9 service between Ginnheim, Riedberg and Nieder-Eschbach does not use the central section and tunnels of the line, making it the only light rail service of the network that does not serve downtown Frankfurt. The Riedberg and Ginnheim branches were planned as parts of the future D line subway but are operationally part of the A line until the D line development and construction is finished.
Frankfurt U-Bahn A-route (Bad Homburg)