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[quote user="Murphy Siding"] The curious mind wonders. Why wouldn't gravel and ballast be sourced from the nearest quarry that does business with the railroad? Are there differing sizes of ballast for different applications? Is there a certain hardness needed for ballast? [/quote] Class 1 railroads usually do have two classes of track ballast. Class 1 ballast is for mainline track, class 2 ballast for all other tracks. The class requirements differ in gradation and abration resistance of the stones. Here is a specification from CN: <a href="http://www.winnipeg.ca/finance/findata/matmgt/documents//2013/539-2013//539-2013_Appendix_D-CN_Ballast_Specification.pdf">http://www.winnipeg.ca/finance/findata/matmgt/documents//2013/539-2013//539-2013_Appendix_D-CN_Ballast_Specification.pdf</a> Regards, Volker (Germany)
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