Abstract: A railroad crosstie plug is positioned within an existing spike hole in a crosstie to restore a predetermined gage between parallel railroad rails. The plug comprises a hollow sleeve having a slot along one side thereof and an interior configuration complimentary to the configuration of the spike. A member separate from the sleeve is pivotally mounted at one end to a lower edge of the slot. The member also defines an impact surface extending across a portion of the interior of the sleeve. When a spike is forced into the sleeve against the impact surface, a second end of the member pivots out of the sleeve and into the surrounding wood of the railroad tie there by locking the sleeve and spike in place within the hole.