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Ask MR: What kind of ballast should I use? - Trains
Track ballast - Wikipedia
Ballast | Trains Magazine
Railroad Ballast: Why Is Such Aggregate Necessary? - American-Rails.com
All about prototype ballast and how to use it on your layout
Railway basics - Railway system - Trackopedia
Essential Components Of A Railroad Track - Rails, Sleepers, Ballast ...
Railway Ballast | Function Of Stones In Railway Track - railroad rails
Everything You Need to Know About Railway Ballast - Adortech
Ballasted and non-ballasted track - Rail