Mattstetten–Rothrist new line  The Mattstetten–Rothrist new line ("Neubaustrecke Mattstetten-Rothrist") is Switzerland's fastest railway, running between Mattstetten and Rothrist. It forms most of the Olten–Bern railway line, which makes up over half of the trunk route connecting Switzerland's main city, Zürich and its capital, Bern. The new line opened on 12 December 2007, as the centrepiece of the Rail 2000 project, a comprehensive upgrade of Swiss railways. The line is almost long, with one branch. At Wanzwil junction, a upgraded former local line to Solothurn connects to the rest of the Jura foot railway line (to Biel/Bienne, Neuchâtel, Yverdon and Geneva). The line has a maximum speed of and has reduced the travel time between major Swiss hubs of Bern, Basel and Zurich to under an hour, allowing the regular interval timetable (German: "Taktfahrplan") to be realized, where both express and stopping trains on all lines arrive and leave on the hour at Bern and Zurich stations, allowing a great number of convenient connections. The line was the longest new line built in Switzerland since 1926. Construction began in April 1996 and the last piece of rail was put into place on 30 April 2004 at the Bern-Solothurn canton border at Inkwil on the connection to Solothurn. The Mattstetten–Rothrist was the first in Switzerland to put the European Train Control System (ETCS) into regular operation. This was originally planned for December 2004 but had to be repeatedly postponed because of technical problems. On 2 July 2006 testing at night was started and trains ran from 22:30 at up to with ETCS; from 23 July testing started at 21:30. Switching from conventional signalling with external signals to in-cab ETCS signalling was successively brought into operation and on 18 March 2007, trains began to run with full ETCS Level 2 signalling at up to ; since December 2007 they have run at up to . The ETCS trackside equipment consists of a Radio Block Center, the required balises and an electronic interlocking.