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  1. Ask MR: What kind of ballast should I use? - Trains

  2. Track ballast - Wikipedia

  3. Ballast | Trains Magazine

  4. Railroad Ballast: Why Is Such Aggregate Necessary? - American-Rails.com

  5. All about prototype ballast and how to use it on your layout

  6. Railway basics - Railway system - Trackopedia

  7. Essential Components Of A Railroad Track - Rails, Sleepers, Ballast ...

  8. Railway Ballast | Function Of Stones In Railway Track - railroad rails

  9. Everything You Need to Know About Railway Ballast - Adortech

  10. Ballasted and non-ballasted track - Rail