The Germany-headquartered company Siemens has confirmed that the value of its rolling stock contract for the Riyadh metro is $2.1bn.

It is the last of the metro project’s rolling stock suppliers to reveal the value of its contract with Saudi Arabia’s Arriyadh Development Authority.

The company is part of the BACS consortium, headed by US firm Bechtel and Athens-based Consolidated Contractors Company and local firm Almabani.

The total order value for the consortium is $10bn and it covers the construction of Lines 1 and 2 of the six-line metro network.

Siemens will be providing 74 of its Inspiro type metro vehicles, as well as the electrification systems and signalling technology to allow for driverless operation of the trains. It is also responsible for system integration of the 63 kilometres making up the lines.

Its signalling and train control technology will allow trains to operate at 90-second intervals, which will allow the system to handle 21,000 passengers an hour.

The Riyadh metro project, which is worth $22.5bn in total, was tendered in three packages, with each featuring a rolling stock award.

France’s Alstom is part of the FAST consortium, which covers lines 4,5, and 6. The French firm’s share of the contract is worth about $1.6bn. Spanish contractor FCC Construcciones is leading the consortium.

Canada’s Bombardier is supplying the systems and trains for the Arriyadh New Mobility Consortium, which won the contract for line 3. The Canadian firm’s share is worth $383m.

All three packages were awarded in late July.

The Riyadh metro network, which is made up of six lines, will be 170km long and will include 87 stations.