. The trackman's helper, a handbook for track foremen, supervisors and engineers . h 18 ins. belowthe top of rail and the berm 24 ins. below the top ofrail at the end of tie and sloping to 3 ft. below top ofrail at back of side ditch. Every 50 ft. one crib iscleaned to the bottom of the center ditch on one endand to the top of subgrade on the other, forming an BALLASTING 127 outlet for water collected in the center ditch. Thisarrangement gives an absolutely dry and stable road-bed. The dirt from the ballast, or so much of it as isrequired, is dressed upon the subgrade outside theballast line,
. The trackman's helper, a handbook for track foremen, supervisors and engineers . h 18 ins. belowthe top of rail and the berm 24 ins. below the top ofrail at the end of tie and sloping to 3 ft. below top ofrail at back of side ditch. Every 50 ft. one crib iscleaned to the bottom of the center ditch on one endand to the top of subgrade on the other, forming an BALLASTING 127 outlet for water collected in the center ditch. Thisarrangement gives an absolutely dry and stable road-bed. The dirt from the ballast, or so much of it as isrequired, is dressed upon the subgrade outside theballast line, and in addition to giving a neat blackappearance and a pleasing contrast to the white stoneballast, serves to keep down weeds very is not required for this purpose is used to widenembankment along the line. As stated above for double track work, three screensare used. When tracks are on fill on both sides, dirtfrom each side screen is disposed of on its own sideof the embankment, and dirt from the center ditch isdumped directly from handbarrow over bank on side. Fig. 22. Roadbed Section for Cut and Fill, B. & O. R. R. most desirable. When one side is on fill and otherside in cut, wheelbarrow loads of dirt are wheeled orcarried bodily from cut side to fill side. When it isnecessary to carry dirt across tracks, care is used tokeep the screen on the side from which it is carried inan advanced position, with reference to the otherscreens, so that dirt will be carried over uncleanedroadbed and not over that which has been will be seen that dirt carried to the fill on other sideof tracks from the center screen passes over dirty bal-last before the arrival of the screen to the right, andlikewise, dirt from the screen to the left passes overthe tracks before the arrival of either of the other twoscreens, the screens in this case traveling from rightto left. When tracks are in cut, on both sides, wheel- 128 THE TRACKMANS HELPER barrow loads are wheeled out to
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