In this paper we describe preliminary work done in the CORTES project[FSg0], applying ttSTS to a transportation planning and scheduling domain. First, we describe in more detail the transportation problems that we are addressing. We then describe the fundamental characteristics of HSTS and we concentrate on the representation of multiple capacity resources. We continue with a more detailed description of the transportation planning problem that we have initially addressed in liSTS and of its solution. Finally we describe future directions for our research.