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Thousands of residents take first ride on Warsaw's long-awaited 2nd subway line

  • First passengers arrive at the Swietokrzyska station to take a ride on Warsaw’s second subway line as it opens, in Warsaw, Poland, Sunday, March 8, 2015. The 6-kilometer (4-mile) line runs East-West and some 8 meters (26 feet) under the Vistula river, linking the eastern Praga district with the downtown. The opening was scheduled for the fall of 2013, but findings of buried, unexploded wartime bombs, and a major water leakage that flooded a nearly-finished station delayed the work. (AP Photo/Alik Keplicz)

    First passengers arrive at the Swietokrzyska station to take a ride on Warsaw’s second subway line as it opens, in Warsaw, Poland, Sunday, March 8, 2015. The 6-kilometer (4-mile) line runs East-West and some 8 meters (26 feet) under the Vistula river, linking the eastern Praga district with the downtown. The opening was scheduled for the fall of 2013, but findings of buried, unexploded wartime bombs, and a major water leakage that flooded a nearly-finished station delayed the work. (AP Photo/Alik Keplicz)  (The Associated Press)

  • First passengers take a ride on Warsaw’s second subway line as it opens, in Warsaw, Poland, Sunday, March 8, 2015. The 6-kilometer (4-mile) line runs East-West and some 8 meters (26 feet) under the Vistula river, linking the eastern Praga district with the downtown. The opening was scheduled for the fall of 2013, but findings of buried, unexploded wartime bombs, and a major water leakage that flooded a nearly-finished station delayed the work. (AP Photo/Alik Keplicz)

    First passengers take a ride on Warsaw’s second subway line as it opens, in Warsaw, Poland, Sunday, March 8, 2015. The 6-kilometer (4-mile) line runs East-West and some 8 meters (26 feet) under the Vistula river, linking the eastern Praga district with the downtown. The opening was scheduled for the fall of 2013, but findings of buried, unexploded wartime bombs, and a major water leakage that flooded a nearly-finished station delayed the work. (AP Photo/Alik Keplicz)  (The Associated Press)

Thousands of Warsaw residents have taken their first rides on the Polish capital's second subway line, just over a year later than expected.

The 6-kilometer (4-mile) line that opened Sunday runs under the Vistula river, linking the eastern Praga district with downtown and western districts. It took five years to build and cost some 4.2 billion zlotys ($1.1 billion).

The opening was scheduled for the fall of 2013, but findings of buried, unexploded World War II explosives and a major water leakage that flooded a nearly-finished station delayed the work.

The M2 line is expected to improve public transport for Warsaw's 1.8 residents and has become even more important since the unexpected closing three weeks ago of a major bridge that was damaged by a fire.