GTMR has a turnover of more than £250m and is responsible for the repair and maintenance of about 21% of the UK's mainline rail network. It employs about 3500 staff and posted pre-tax profit of £10.2m for the year to 31 March 2001.
Carillion chief executive John McDonough said expanding the group's rail maintenance and repair business was part of Carillion's strategy.
GTMR will make a significant contribution to our future growth
John McDonough, chief executive, Carillion
He said: "With the rail market growing, and with increasing opportunities to offer added value services … GTMR will make a significant contribution to our future growth."