The Nantenbach Curve (Nantenbacher Kurve) connects the Main-Spessart railway and the Hanover-Würzburg high-speed railway between the operations yard of Rohrbach on the high-speed line and Nantenbach junction, east of Lohr, on the Main-Spessart railway. This shortcut allows long-distance trains to use the high-speed line between Würzburg and Lohr and shortens their travel times considerably as the curvy section through the Main valley only permits moderate speeds.