The audit's main aim is to understand whether the existing procurement and contracting models are efficient and enable an effective and economic delivery of the Rail Baltica project.
The $239 million order for 70 diesel-electric locomotives, announced on October 11, follows an order for 10 diesel-electric locomotives in May.
Located at Safran's Toulouse base in France, the centre will accommodate up to 100 engineers to develop the rail systems of today and tomorrow.
The manufacturer is currently supplying trams to Helsinki, the city of Tampere and coaches for Finnish Railways.
Renfe runs 5,000 trains daily on 7,500 miles of track. In 2017 it moved more than 487 million passengers and 19.6 million tons of freight.
Including future options, training and maintenance, the total value of the contract is around €39 million.
HS2 has released concept images of two of its brand new stations: Curzon Street in Birmingham and Interchange in Solihull.
Around 45 per cent of the tram will be covered in large windows. Six passenger information screens will feature inside as will USB charging points - a first in France.
APTA and UITP will strive to work together on areas of mutual benefit to their respective memberships to maximise the value of their services.
Chris Grayling said the line, which will link Oxford and Cambridgeshire via Bicester, Milton Keynes and Bedford, will "transform journeys in one of Europe's most vibrant economic regions".