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Railroad ties.
The gravel under and around the ties is called ballast.
Railroad cross ties made out of wood would float. Concrete railroad ties would not float.
3000 railroad ties per mile in the USA
That is called ballast. Ballast is used to support the railroad ties.
Where do I get free Railroad ties If you live in mesa az. call 480 516 5285
Railroad ties, popularly known as Sleepers.
2 ft
Railroad ties. The material cost is cheaper. Labor is less skilled and cheaper. Ties will not require a foundation or drainage engineering. Make sure to insert a "deadman" every now and then if the wall is over 4 feet..
John Henry
Telephone poles and railroad ties.
Many nurseries and landscaping companies carry them.