Beginning 14 June 2009 the journey between Brussels and Cologne was shortened by 19 minutes when the new high-speed line HSL 3 between Liège and Aachen opened using Deutsche Bahn's thrice-daily ICE trains running between Brussels and Frankfurt. HSL 3 was completed in 2007, but Thalys trains had not yet been equipped with the European Train Control System (ETCS) signaling equipment necessary to use the new line. After installation and testing, Thalys began operating on HSL 3 on 13 December 2009. For the same reasons, Thalys started operating on the HSL 4/HSL-Zuid high-speed line between Antwerp and Amsterdam 13 December 2009, two years after the line's construction.