 The upper level serves trains on the north-south axis of the system, with trains heading southbound to Park Station in central Johannesburg and northbound to Pretoria, while the lower level has only one platform and acts as the terminus for OR Tambo International Airport-bound trains.Sandton station is the operational hub of the Gautrain system.Along with Marlboro, it is one of only two stations in the entire network to be served by all trains on the Airport and North-South lines.