This transcript is not from Zork Zero, but will give you a good feeling for how Infocom's interactive fiction works. It contains some simple puzzles and their solutions. The map represents the terrain in the sample transcript as you might have drawn it. You are standing at the precipice of a gaping chasm, which is spanned by a tramway. The tramway hangs from the cavern roof above the chasm.
Tunnels lead north, northeast, and east.
On the south wall is an unlabelled black button. You can see a tram car and a jar here. It seems that the jar is full of tomato sauce. There's no one in the tram car. Later, the boy awoke and Nurse Lanolin bustled to his side.