Carillion was Network Rail’s most-used contractor in the last financial year, fresh data has revealed.
The Wolverhampton-based company was paid £281M by the rail infrastructure operator in 2013/14.
Babcock Rail earned £220M over the same period, with Bam Nuttall close behind on £209M.
The trio of contractors accounted for a tenth of Network Rail’s spending on suppliers, with only electricity provider EDF Energy being paid more.
Costain, which was top of the contractor spending table in the previous financial year, was fourth this time round, despite its income from the client soaring from £184M to £203M.
Network Rail released the figures as part of a refresh of its transparency portal.
Mark Farrow, head of transparency for Network Rail, said: “We’re continuing to publish more data as part of our commitment to being more open and transparent about what we do and the way we do it.”