The airport's runway will be expanded from the current 1.5 km to 4 km.
The contractor is finalising the erection of wall barriers along the bypass adjacent to Kibera.
The existing road infrastructure does not provide for bus lanes.
Kenya, Uganda, and Rwanda will each finance the sections of the line under their territories.
Decision was made after Kenya failed to raise 15% of the project cost.
The region had 61 mega infrastructure projects valued at Sh5.8 trillion in 2015.
Some of the major negative effects of the SGR on the Kenyan economy.
The upgrade will enable the airport to handle large aircraft such as Boeing 767 and Boeing 467.
Treasury has been releasing funds meant for the project periodically.
The State has shortlisted three firms from a pool of five contractors that bid for the work.
Developers will be allowed to build up to 75 floors in high-density areas.
The much-awaited summit will take place on June 12-13, 2025.
All development applications will now require residents' approval.