. Railroad structures and estimates . The cost of maintaining the self-locking bolts may be esti-mated at from $10 to $12 per year (bolts tightened twice a year). The cost of maintaining the nut locks may be estimated atfrom $6 to $8 per year (bolts tightened once a year) per mile oftrack. H. p. TRACK SIZES OF NUT LOCKS. Approximate Size,in. Effec-tivepres-sures inpounds. Dimensions. Num-ber perkeg. Approx. netweightper M., lb. Wt. of keg,lb. Num-ber of number of hipower required per mile of track. A,, in. B,, in. c, width,in. D, height,in. hipowerreqred for load.

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. Railroad structures and estimates . The cost of maintaining the self-locking bolts may be esti-mated at from $10 to $12 per year (bolts tightened twice a year). The cost of maintaining the nut locks may be estimated atfrom $6 to $8 per year (bolts tightened once a year) per mile oftrack. H. p. TRACK SIZES OF NUT LOCKS. Approximate Size,in. Effec-tivepres-sures inpounds. Dimensions. Num-ber perkeg. Approx. netweightper M., lb. Wt. of keg,lb. Num-ber of number of hipower required per mile of track. A,, in. B,, in. c, width,in. D, height,in. hipowerreqred for load. 3 4, 1 1 nu 6,000 8,000 10,000 12,500 15,000 mm 2/5 5. 8 hi I4, 2,5002000150010001000 72109122160186 1010101010 462,000 33 rail, 4 bolt splices, 1280 33 rail, 6 bolt splices, 1920 30 rail, 4 bolt splices, 1408 30 rail, 6 bolt splices, 2112 328,000263,000206,000178,000 TRACK BOLTS. 195. U. S. STANDARD AND HARVEY GRIP TRACK BOLTS. ^ Enlargement of Thread 5^ Vr^ 7^ ggo 10 times Full Size ^ ^ ^^ Min, y___-±

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