Naamsa says the market has responded positively in anticipation of improved economic prospects, although exports have declined.
The price of all grades of petrol and diesel will drop on Wednesday.
"Longer transit times are impacting South Africa in the form of equipment and vessel shortages."
The rehabilitation work involves a distance of 614 kilometres of railway line.
The locally built vessels will replace two existing boats that have reached the end of their design lifespan.
Emerging markets are becoming increasingly attractive for shipping lines looking to mitigate against risks.
The vehicle was transporting 11 people when its engine failed at a level crossing.
The latest adjustment brings the total estimate for 2024 exports of lemons to 33.9 million cartons.
