Citex has been appointed by Japanese joint venture Evergreen Construction-Shimizu Corporation to provide contract consultancy and programming on 28.5 km of viaducts around Tainan.
RMJM, appointed by a consortium led by Japanese engineer Heigo Shen, will design sections of track, bridges and a 33 000 m2 station at Taoyuan, south of Chiang Kai Shek Airport.
Managing director of RMJM Hong Kong Ian Butler said: "It is a huge interchange like Waterloo station."
The rail link will run 330 km from Taipei to the south of the island. It will include 11 stations and 330 km of embankments, viaducts and tunnels. The stations are due to start on site in 2003.
The Taiwanese government is contributing £2.2bn to the project.