[Code of Federal Regulations] [Title 49, Volume 4] [Revised as of October 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR213.103] [Page 103] TITLE 49--TRANSPORTATION CHAPTER II--FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 213_TRACK SAFETY STANDARDS--Table of Contents Subpart D_Track Structure Sec. 213.103 Ballast; general. Unless it is otherwise structurally supported, all track shall be supported by material which will-- (a) Transmit and distribute the load of the track and railroad rolling equipment to the subgrade; (b) Restrain the track laterally, longitudinally, and vertically under dynamic loads imposed by railroad rolling equipment and thermal stress exerted by the rails; (c) Provide adequate drainage for the track; and (d) Maintain proper track crosslevel, surface, and alinement.