[6] Throughout early 2013, Qatar Rail released the D&B tenders and received submissions from various international firms to construct sections of Phase 1a, corresponding to the Red and Green Lines.

[8] In May 2014 a consortium of Larsen & Toubro, Aktor, Yapi Merkezi, STFA Group and Al Jaber Engineering was awarded to design and construct the Doha Metro Gold Line.

[12] Qatar Rail chose to integrate Qatari culture into the Metro by naming stations after historical towns and cities, each with its own story and background.

[21] A North-South Line connecting the towns of Lusail, West Bay, Msheireb, Hamad International Airport and Al Wakra.

[23] One of the key elements of the design is the exterior shape of the station; this uses bright, modern materials to simulate the interior of an oyster.

The levels of the stations will be open to each other giving passengers at feeling of comfort, and concealing the lighting and ventilation in the shapes of the arches.

[24] In May 2016, Consolidated Contractors (CCC) took over[25] the contract for the Msheireb and Education City stations, from a joint venture of Samsung C&T Corporation (S. Korea), Obrascon Huarte Lein (Spain), and Qatar Building Company.

[26] The 75 three-car driverless trainsets for the metro system are supplied jointly by Japanese companies Mitsubishi Corporation and Kinki Sharyo.

The company will also supply the platform screen doors and tunnel ventilation and will be responsible with overall project management and system integration.

[36] In 2017, Qatar Rail received the ITA Award from the International Tunneling and Underground Space Association for the Major Project of the year 2017.

[37] Computers, network infrastructure and other related equipment were provided by IBM, Lenovo, Hewlett-Packard, Siemens and Cisco Systems.

The planned procedures involve elements that can guarantee a safe working environment, far from the risks of injuries, including managing emergency cases and treating them swiftly.

The company proposed its safety and security programme, along with its recommendations and a full roadmap towards the future operation stage of the railway.

[40] In June 2014, it was announced that the Doha Metro Green Line Project achieved 6 million work hours without a lost time injury (LTI).