For the purpose of this Zoning Code, railroad rights-of-way shall be permitted as authorized and regulated by state and federal laws, it being the intent of this chapter to exempt railroad rights-of-way from the application of this Zoning Code. Buildings and structures intended to be erected or constructed within the railroad rights-of-way shall comply with the use, area, and height regulations of the district in which it is located. Spur tracks shall be extended from the existing railroad right-of-way to adjacent industrial districts only when they are totally within Industrial Districts.