M1. Subballast

Parent Materials
Gradation
Gradations

M2. Track Ballast

Parent Materials
Designation

M3. Track Cross Ties

Parent Materials
Rail Bearing Area
Design
Inspection
Grades
Manufacture
Machining
Grading Rules
Seasoning
Treatment

M4. Track Rail

Design
New Rail
Secondhand Rail

M5. Other Track Materials

Joint Bars
Compromise Joint Bars
Insulated Joint Bars
Track Bolt Assemblies
Tie Plates
Track Spikes
Rail Anchors
Gage Rods
Tie Plugs
Drive Spikes
Tie Pads

M6. Turnout Materials

New Turnouts
Secondhand Turnouts

M7. Grade Crossing Materials

Timbers

Solid Timber Crossing
Bond Timber Crossing

Asphalt
Ballast