How Northern Pacific is using special equipment pulled along behind work train to skeletonize and make initial lift or new ballast without jacks; as plow or sled moves along, track is "humped up" over it, bottoms of ties sliding across runners on top of device; with plow, crib material is carried to shoulder; sled redeposits ballast in layer under ties. (See also Ry Age v 139 n 5 Aug 1 1955 p 18-21)
Raising track with "sleds"
Ry Track Structures
Railway Track and Structures ; 51 , n 8
1955
5 pages
Aufsatz (Zeitschrift)
Englisch
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