Journey times between London and Brussels were improved when an 88-kilometre (55 mi) Belgian high-speed line, HSL 1 , opened on 14 December 1997.   It links with LGV Nord on the border with France, allowing Eurostar trains heading to Brussels to make the transition between the two without having to reduce speed. A further four-minute improvement for London–Brussels trains was achieved in December 2006 with the opening of the 435-metre (1,427 ft) Brussels South Viaduct .  Linking the international platforms of Brussels-South railway station with the high-speed line, the viaduct separates Eurostar (and Thalys) from local services.
In 2010 there was some chatter on the listservs about a (smaller & cheaper) set of low-noise mics from Telinga , as well as a similar system from Mike Rooke at . (Store now closed.) It seems as though another Primo capsule is at the heart of these new mics (based on the low noise mic spreadsheet (xls file) maintained by Rob Danielson ). It’s the EM172 ( pdf datasheet ) and it has a FET already built-in, so it behaves just like the trusty old Panasonic WM-61a (except not noisy!) Mike has a fantastic blog featuring extensive mic-building experiments with sound clips, explanations, and measurements.