The high cost of transportation in Brazil, according to logistics is notorius. Mainly to farming products related to commodities, this relationship is still problematic because they don´t have any extra value. Sugar, can be considered as the most important farming trend. So, rail transportation seems to be the solution in terms of competitive prices to many kinds of products, including sugar. The main objective of this study is to identify the importance of rail transportation for sugar. But, it especifically contibutes to analyze the Middle-South transportation system to flow this production at that region. At first, it`s estimated the future sugar production. Then, it`s done the survey of the narrow places, analyzing the Brazilian capacity for that. As it has been growing, they work with a hypothetical future impossibility. The alternatives are detailed and the several costs calculated to identify the potential freight and load amount aimed to Middle-South and so the number of harbors.