Useful Reference Tables

Conversions Drawings
Conversion Length (frac/inch/mm) AutoCAD Pen Assignments & Colors
Conversion Speed (MPH/KPH) Orthographic Drawing Reference
  Pantone Color Chart
Physical Properties   
Corrosion and the Galvanic Series of Metals Materials, Design & Tooling
Densities of Common Materials AWS Welding Symbol Quick Reference
  AWS Welding Symbol Chart 
Threaded Fastener Strength & Plating
Rail Transit Screw Sizes (US & Metric)
Flammability Smoke & Toxicity Drill Bit Sizes / Applications
FRA Track Classification and Speed Limits Sheet Metal Gauge Thickness
Rail Vehicle Overhaul Considerations Wire Gauge Sizes
Track Clearance Plates Steel Pipe Sizes