. Railway track and track work . epairs, have a 15-in lift, and acapacity of 10 tons, the jack being 35 ins. high when lowered, and weighing90 lbs. A smaller size of the same capacity for short and heavy lifts insurfacing has a 7-in. lift, is 22 ins. high, and weighs 55 lbs. For light sur-facing the jack has a capacity of 5 tons, a lift of 12 ins., is 31 ins. high, andweighs 60 lbs. The load can be lowered instantly or slowly. The ratchetjack, which is shown in Pig. 184, has a frame of malleable iron, with a base7 x 12 ins., as recommended by the Roadmasters Association of the othe
. Railway track and track work . epairs, have a 15-in lift, and acapacity of 10 tons, the jack being 35 ins. high when lowered, and weighing90 lbs. A smaller size of the same capacity for short and heavy lifts insurfacing has a 7-in. lift, is 22 ins. high, and weighs 55 lbs. For light sur-facing the jack has a capacity of 5 tons, a lift of 12 ins., is 31 ins. high, andweighs 60 lbs. The load can be lowered instantly or slowly. The ratchetjack, which is shown in Pig. 184, has a frame of malleable iron, with a base7 x 12 ins., as recommended by the Roadmasters Association of the other parts are of crucible steel, with the exception of the loosepipe handle. The rack bar (A) has a sectional area of ly2 sq. ins., and isoperated by the. lever (B) and pawl (D), while the top catch (C) holds thebar in position at the height at which it is set. The load can be let downone tooth at a time when required, and can be dropped instantly and withcertainty by the lower pawl, no independent trip being required. The jack is. Fig. 185.—Track Drill. 21 ins. high, and has a lift of 14 ins., while its lifting capacity is 10 tons,and its weight 50 lbs. Hydraulic and screw jacks allow for very close ad-justment on exceptionally good track. On many roads, the jack is now used instead of the raising bar for smalllifts, as in surfacing, etc., as well as for large lifts in raising lengths oftrack, while on other roads it is used only at frogs and switches, and forlifts of over 3 ins. The best practice is to raise both sides of the tracksimultaneously by the use of two jacks, and in general the claw shouldbe placed under the tie and not under the rail, as in the latter case it tendsto loosen the spikes. The jack should never be set on the inside of the rail,as in such position it is liable to derail a train, as was the case in theaccident at Quincy, Mass., on the Old Colony Ry., in 1890, in persons were killed or fatally injured, and about 30 were more ;less injured.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
