Dear Folks!<br/><br/>I'm not sure whether we say:<br/><ol><li><i><b>The sum of constructed <span style="color:#ff6600;">railway/railways</span> accounts for 10,000km.</b></i></li><li><i><b>The company's aim is to take part in<span style="color:#ff6600;"> highway/s</span> construction projects</b></i></li></ol></br><br/><br/>Cheers,