first line
...that part of the first line of the Berlin U-Bahn was built as an elevated railway , because the City of Berlin feared that an underground railway would damage one of its new trunk sewers?
...that part of the <b id="mwAuk"><a href="./U1_(Berlin_U-Bahn)" id="mwAuo" rel="mw:WikiLink" title="U1 (Berlin U-Bahn)">first line</a></b>  of the <a href="./Berlin_U-Bahn" id="mwAus" rel="mw:WikiLink" title="Berlin U-Bahn">Berlin U-Bahn</a> was built as an <a href="./Elevated_railway" id="mwAuw" rel="mw:WikiLink" title="Elevated railway">elevated railway</a> <i id="mwAu0">(pictured)</i>, because the City of <a href="./Berlin" id="mwAu4" rel="mw:WikiLink" title="Berlin">Berlin</a> feared that an underground railway would damage one of its new trunk sewers?