Railroad spikes have long been considered a powerful source of protection in both hoodoo and witchcraft.
In hoodoo, it is common to put a spike along each corner of one’s property, cover them with graveyard dirt, and urinate on them. This will ground the practitioner to their land.
You can also simply place railroad spikes or other iron items near each doorway. A good example of this is the tradition of placing a horseshoe over an entrance.
Many people, whether witches or simply superstitious, use railroad spikes as a doorstop and then place them alongside the door when it is closed.
The iron of the railway spike also keeps the fae at bay as they can’t touch of be near it.