Ideally, the problem would require two possible actions, and not allow inaction. Two possible avenues for such a formulation are
1) The lever is in an intermediate state, that will cause the trolley to set into effect some global catastrophe, and therefore must be pulled in one of two directions. This may be a rather unconvincing scenario.
2) Have two trollies, each running down their own track, and the operator has a choice which of two levers---only one of which can be reached in time---to pull to detour a trolley to a harmless side track.
1) The lever is in an intermediate state, that will cause the trolley to set into effect some global catastrophe, and therefore must be pulled in one of two directions. This may be a rather unconvincing scenario.
2) Have two trollies, each running down their own track, and the operator has a choice which of two levers---only one of which can be reached in time---to pull to detour a trolley to a harmless side track.