D1. Track Classifications
      Industry Track Categories
      Industry Service Track
      Service Categories
        Unit Train Service
        General Service
      Other Use Descriptions
        IC Switched
        Owner Switched
        Leased Track
    D2. Track Geometry
      Components of Horizontal Alignment
        Turnout
        Horizontal Curves
        Horizontal Spirals
      Tangent Track
      Components of Vertical Alignment
        Grade
        Vertical Curves
      Curve Compensation
      Superelevation
      End-of-Track Fixtures
    D3. Track Side and Overhead Clearances
      Legal Obligation
      Agreement
      Track Curvature
      Warning Signs
      Overhead Wires
    D4. Track Section
      Design Drawings
      Rail and Fastenings
      Tie Plates and Track Spikes
      Cross Ties
      Other Appurtenances
      Ballast Designation
      Depth of Subballast and Ballast
      Turnouts
      Signaling
    D5. Roadway Section
      Typical Section Geometry
      Soils Investigation
      Subgrade Stabilization
      Subballast
      Geo-Technical Fabric
      Ditches
      Drainage Conduits
      Special Drainage Situations
    D6. Grade Crossings
      Types
      Uses
      Approaches
    Figures