Container terminals, which are part of the global port system, represent important hubs of this intermodal transport system. Therefore, the need to improve operational efficiency is the most important problem for container terminals from an economic point of view. In this article, the main objective is to simulate a transshipment operation in the port of Tangier. A mathematical model is developed to formulate an integrated processing system and find an efficient solution algorithm for the Rubber-tyred gantry (RTGs) deployment as a handling equipment for container stacking at terminals, taking into account both the loading and unloading times.