Eisenbahn-Bundesamt
The work on the first “Böblingen” section was completed in late March 2007. The Federal Railway Authority ("Eisenbahn-Bundesamt") approved at the beginning of May 2007 the second "Sindelfingen" planning section and the Verband Region Stuttgart (which coordinates public transport in the Stuttgart Region) issued zoning approval for it. The main work on this section was carried out in 2008 and the track was completely blockaded from the end of March to October 2008.