US engineering firm Bechtel has filed a legal claim against HS2 after it failed to secure a £1bn contract to construct Old Oak Common station
In 2018 Bechtel signed a £170m contract to deliver phase 2b of HS2, which will stretch from Crewe to Manchester, and the West Midlands to Leeds.
The Sunday Times reported that Bechtel had lodged a claim with the Technology and Construction Court over the handling of the procurement process.
Last month Balfour Beatty and Vinci were named joint construction partners to deliver Old Oak Common station.
Bechtel is thought to be unhappy about the scoring of its bid after receiving feedback from HS2 in a 200-page document.
The firm retracted from bidding last year for the Euston Station terminal to focus its efforts on Old Oak Common.
The latest legal action from Bechtel will come as an additional setback for transport secretary Chris Grayling, who is battling calls to resign after agreeing a £33m settlement with Eurotunnel over his decision to award three suppliers with contracts to provide extra ferries in a no-deal Brexit.
Both HS2 and Bechtel declined to comment.