Making the observation of export incomes in the Balances of Payment (BoP) of the Baltic States it was observed that there was no coherency between trends of rail and sea transport service income level. This study was aimed at the examination of this phenomenon in order to understand what causes service income level differences and if it influences the competitiveness of transit corridors of the Baltic States. A combination of statistical methods for data processing was used: grouping, extension and graphical representation as well as trend analysis. It was concluded that total seaport-rail charge level in international transportation has an increasing trend, where rail service charge level rises faster than that in maritime service. Incoherence and duplication of processes, inelastic charge regulation as well as uneven capacity usage affect the competitiveness of the observed transport corridors and are not compensated by market mechanism and, therefore, should be taken into account when developing strategies for improving transit corridor competitiveness.