Dreaming about a nuclear bomb reminds feelings of helplessness, being threatened and the loss of control. You can feel great hostility and anger to the point of being destructive. Alternatively, it shows a desire to wipe out some aspects of yourself. It can also mean that something crucial and precious to you is going to end and major changes will come soon.
Dream dictionary: wipe dream meanings
…If you dream of a railroad, you will find that your business will need close attention, as enemies are trying to usurp you. For a young woman Dreaming of railroads, she will make a journey to visit friends, and will enjoy some distinction. To see an obstruction on these roads, indicates foul play in your affairs. To walk the cross ties of a railroad, signifies a time of worry and laborious work. To walk the rails, you may expect to obtain much happiness from your skilful manipulation of affairs. To see a road inundated with clear water, foretells that pleasure will wipe out misfortune for a time, but it will rise, phoenix like, again….
Torches show funerals, to wipe on towels a bad fate.