Frankfurt City Tunnel

Frankfurt City Tunnel
train to Bad Soden at Hauptbahnhof low level, ET 420
Overview
Native name	City-Tunnel Frankfurt
Line number	3681 (from Hbf) 3682 (to Hbf) 3680 (Schlachthof–Offenbach)
Locale	Frankfurt, Hesse, Germany
Service
Route number	645.2, 645.5, 645.6
Technical
Line length	6.36 km (3.95 mi)
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Electrification	15 kV/16.7 Hz AC overhead catenary
Route map Legend km Hauptbahnhof ramp Frankfurt underground 50.0 Taunusanlage 50.8 U-Bahn to Praunheim/Hausen Hauptwache 51.6 Konstablerwache 52.2 U-Bahn to Ostbahnhof/Enkheim (planned) to North Main S-Bahn 52.6 Ostendstraße 53.0 Main River Frankfurt Schlachthof junction 53.8 Lokalbahnhof 54.4 ( 4728 m 5171 yd ) end of Frankfurt City Tunnel Frankfurt–Göttingen railway (South Main line) to Frankfurt South Frankfurt Süd–Aschaffenburg railway (North Main line) to Hanau Mühlberg 54.4 Frankfurt–Göttingen railway (South Main line) to Hanau ( 1633 m 1786 yd ) end of Frankfurt-Mühlberg Tunnel (planned) Oberrad Frankfurt Schlachthof–Hanau railway (S-Bahn) to Hanau north side

The Frankfurt City Tunnel is a standard gauge railway in Frankfurt and the core of the Rhine-Main S-Bahn. The line runs underground for its entire length.