Warsaw cross-city line (Polish: Linia Średnicowa w Warszawie) is a 7 km (4.3 mi) railway line crossing Central Warsaw in the east–west direction. Opened in 1933 and electrified in 1936, it initially had two tracks, with an additional two added in 1967.[1] The central part of the line is in a tunnel, which is 2,226 m (7,303 ft 2 in) long.[2] It then crosses the Vistula by the Średnicowy railway bridge 470.15 m (1,542 ft 6 in)[3] long located between Poniatowski Bridge and Świętokrzyski Bridge.