Signalling, train control, and telecommunications will be provided by Thales and Alstom, which will supply its Urbalis 200 signalling system, points machines, and station signalling equipment. A consortium of Colas Rail, Orascom, and Arabco will be responsible for infrastructure, with Alstom providing power supplies, electromechanical equipment and ventilation systems.

Alstom's share of the two contracts is worth €80m.

A consortium of Vinci and Bouygues is carrying out civil works on the five-station extension, which is due to open in early 2018. The opening of Phase 4A is expected to boost ridership on Line 3 to around 750,000 passengers per day.

Last December the French government agreed to provide a €344m loan to finance the acquisition of 64 trains for Line 3 and the new Line 4.

The 19km first phase of Line 4 will run from El-Malek El-Saleh on Line 1, via Giza on Line 2, west to Remaya Square.