. Railroad structures and estimates . on. — The walls are usually built of stone or con-crete or 12X12 cedar timbers. When concrete is used a liningof fire brick is built on the inside face of walls, and when of tim-ber old boiler plate is used. The lining of fire brick or otherprotection is necessary to protect the walls from the detrimentaleffect of hot ashes. On account of the wave action when theengines travel over the pit it is difficult to keep the rails anchoredto the masonry, and for this reason wood stringers, or cast-ironrail chairs 3-foot to 4-foot centers are used frequently. The w
. Railroad structures and estimates . on. — The walls are usually built of stone or con-crete or 12X12 cedar timbers. When concrete is used a liningof fire brick is built on the inside face of walls, and when of tim-ber old boiler plate is used. The lining of fire brick or otherprotection is necessary to protect the walls from the detrimentaleffect of hot ashes. On account of the wave action when theengines travel over the pit it is difficult to keep the rails anchoredto the masonry, and for this reason wood stringers, or cast-ironrail chairs 3-foot to 4-foot centers are used frequently. The woodstringers are protected by a covering of sheet metal. Water is used to cool the ashes, and this necessitates a waterservice with hose connection, valves, etc., and proper sump hole 12 inches wide and 12 inches deep at one end ofthe pit, with the floor dished so as to drain to the sump, servesthe purpose, the outlet to drain being placed on the side of thewall about 6 inches above the floor of sump. P». 12 x ustringer. Fig. 74. Shallow Ash Pit. Shallow Pit. (Fig. 74.)—This type of pit is built in longlengths, and necessitates sufficient help being on hand to removethe ashes promptly. It is also used for temporary work duringconstruction and occasionally on main lines. Approximate cost, $5 to $7 per lineal foot complete. 158 RAILROAD STRUCTURES AND ESTIMATES. Deep Ash Pit, Closed Sides. (Fig. 75.)—The deep ash pit isconstructed somewhat after the ordinary engine house pit, built
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