In the airport sector, same story, yes it has been expanded but Kisumu Airport (sorry International Airport) cost just over Ksh2bn to bring it into the late 20th century. Numerous other airstrips have also been snatched from cows who were using them as grazing fields. Rehabilitation...
In the rail sector, we've neglected this key channel for so long that the cost to update it (wholesale including tracks, trains et al), will be quite enormous. Another rehabilitation job.
The point. Let GoK create a special repair and maintenance budget portion which will be increased annually as we increase the number of roads, airstrips et al such that that there is a greater concentration on repairs rather than rehabilitation. Its cheaper. Secondly, we need to think around how we can maintain this transport system. Trailers are decimating the Northern corridor because they are carrying weight that should be borne by railtracks not a road. The type of inputs used to build/rehabilitate are also important. Mbagathi Way was built using concrete and has a 20yr life expectancy. Its costs were projected to only be 8% than tarmacking which lasts at most 2 years (3 months when done by a Kenyan contractor).