130 Northern Pacific Gray Model Railroad Ballast is a flat gray ballast.
1300 Medium Gray Powder
1301 Northern Pacific Gray N Ballast
1302 Northern Pacific Gray HO Ballast
1303 Northern Pacific Gray HO Mainline Ballast
1304 Northern Pacific Gray Large Scale Ballast
1305 Casada Gray Boulders
1306 Northern Pacific Gray Rip Rap
1307 Northern Pacific Large Rip Rap
Track ballast forms the trackbed upon which railroad ties (sleepers) are laid. It is packed between, below, and around the ties. It is used to bear the load from the railroad ties, to facilitate drainage of water, and to keep down vegetation that might interfere with the track structure. The ballast also holds the track in place as the trains roll over it. It consists of crushed stone. The term “ballast” comes from a nautical term for the stones used to stabilize a ship.