Close They were commissioned to design and build a 50-mile section of the high speed railway roughly between Aylesbury and Royal Leamington Spa Carillion's collapse threatens HS2 and other major transport infrastructure projects across the UK -- infrastructure projects before its collapse. The construction giant is in a partnership which won two HS2 deals worth £1.34bn. -- deliver on the work if one of the partners collapsed. A HS2 spokesman described Carillon going into liquidation as “clearly disappointing for them and the wider UK construction industry”.