The ghost of Zolt n is rewarded for a good life by being allowed to drive the cog-wheel railway up and down the Buda hills at night. This had been Zolt n's life ambition, and he is very happy. However, the people living near the cog-wheel railway are worried why the railway is running when it should be closed down for the night. So they call the police, who try to set a trap for whoever is driving the railway. But the trap does not work, as the police cannot see the ghost of Zolt n driving the train. The local dogs and cats, who can see ghosts, welcome Zolt n and the night journeys of the cog-wheel railway.