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Grade Separations Rail over Road Steel preferred structure type as it can be repaired Concrete bridges - sacrificial beam or crash beam Depth of structure increases rapidly with span length under railroad loading Decreases clearance or increase required railroad fill Standard Specifications for Transportation Materials and ix INTRODUCTION This Thirty-Fourth Edition of Transportation Materials is published in two parts. Part 1 contains specifications for materials, and Part 2 includes methods of testing and specifications for testing equipment.CONSTRUCTION STANDARDS STANDARD DRAWINGS136. 43 2210 Rev. J Transmission Line Structure Standards Steel Pole Structures Maintenance Provisions Details . 137. 43 2211 Rev. B Light Duty Transmission Line Steel Pole Structures Climbing Provisions . . 43 2212 Access Road Standards Access Roads General Requirements . 139. 43