In 1933, the connection between the Main Station (former Vienna St.) and the Terespol St. was built: as it ran through the densely built-up city center, it was built in a tunnel. This tunnel along with a bridge is called "Średnicowy" (Cross-City Tunnel) and has approximately . Year 1934 saw the opening of the railway to Radom and further to Kraków. There are two railway bridges in Warsaw: