Don't know if it is a bug or I'm just missing something, but after setting up the first bus line in the tutorial I bought 4 vehicles to operate it. The first bus left the Depot and startet ist tour. Then I edited the time table and increased the Intervalls by 30 minutes, just because it was suggested by the tutorial. The first bus completed ist tour, returned to the Depot and since then no bus left it. All 4 are just Standing there, doing nothing and I can't find a way to force them out.