The project will involve the construction of a 138-km (85.75 miles) high-voltage transmission line to take power to South Sudan, the expansion of two substations and construction of one new one.
However, the Limuru and Ruiru routes will remain suspended due to ongoing repair works on the railway lines following heavy rains.
The extension of SGR is expected to boost economic growth and facilitate trade across the East African Community.
The Nairobi Inland Container Depot experienced a parallel decline with container traffic decreasing from 403,665 in 2022 to 332,100.
Once complete, the link will enable passengers to travel between Mombasa Central Railway station at the CBD and Mombasa Terminus in Miritini with ease.
This is the first time new wagons have been added since the launch of the SGR in May 2017.
Residents, civil society groups, and leaders gathered in Mombasa to deliberate on the intricacies of the Standard Gauge Railway (SGR) project and its implications.
The state-owned rail company said the rains had affected normal train operations, including cargo transfers, loading as well as offloading activities at the Port of Mombasa.