Network Rail has publicly released the amount it has spent with its top-20 suppliers including Costain, Carillion and Balfour Beatty in the last year.
The rail body spends around 5bn annually on works, services or products, of which around 45 per cent of its total expenditure is with the top 20 suppliers.
The highest paid construction contractor in the financial year to April 2013 was Costain, which was paid £184.5m for infrastructure contracting, or around 3.4 per cent of the total.
Network Rail spending:
Supplier name Spend Description of goods, services or product (% of total)
EDF Energy £296.6m Electricity supply (5.4%)
Costain £184.5m Infrastructure contracting (3.4)
Carillion Construction £180.2m Infrastructure contracting (3.3)
Babcock Rail £177.4m Track infrastructure contracting (3.2)
Balfour Beatty Civil Engineering £170.3m Infrastructure contracting (3.1)
Amey-Colas £166.2m Track infrastructure contracting (3)
Invensys Rail £159.1m Signalling infrastructure contracting (2.9)
Atkins £120.6m Signalling infrastructure contracting, consultancy services (2.2)
Tata Steel UK £114.9m Steel rail supply (2.1)
J Murphy & Sons £102.2m Infrastructure contracting (1.9)
Balfour Beatty Rail £100.2m Track infrastructure contracting (1.8)
DB Schenker Rail (UK) £98.5m Rail logistics (1.8)
Bam Nuttall £94.3m Infrastructure contracting (1.7)
VolkerFitzpatrick £88.5m Infrastructure contracting (1.6)
Amey OWR £86.4m Structural inspection services (1.6)
Signalling Solutions £84.7m Signalling infrastructure contracting (1.5)