Entire track switches, just as with a transfer track, station would have to be set up like Manta. One train is on the connected track ready to go, while the other is on the isolated track for (un)load. Once the one train has finished its course, that track moves into isolated position and the the one that was isolated connects to the main track. If I am not mistaken, the Mack Power Splash in Walibi Belgium has a system like this.