Report of the Gen. Mgr's Com. on the Penn. R. R., appointed to determine by experiment the necessary depth. (From Bul. 136 of Am. Ry. Engng. Assn.) (3500 w.) (No. 25297)
Depth of stone Ballast
Ry Age Gaz
1911
Ills.
Article (Journal)
English
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Experiment to determine the necessary depth of stone Ballast
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