It shall be a summary offense for any railroad to continue to obstruct or block up the passage of any private crossing, wherever any private road or crossing-place may be necessary to enable the occupant or occupants of land or farms to pass over the railroad with livestock, wagons and implements of husbandry, after the railroad shall have received at least 15 minutes verbal notice to remove its rolling stock, or other obstructions from any such private road or crossing-place.