. Railroad structures and estimates . 6-in. and 4-in. tile drainagefor track work. French or Rock Drains. — For draining an embankment the■ French or rock drains are used to a large extent on the SantaFe. These are simply trenches filled with broken stone, 3 to 4f*. wide, ordinarily at right angles to the track and extending to I depth sufficient to drain the water pocket. Some cases extend entirely through and in other cases onlyfrom about the center to one face of the embankment. Thebottom of the trench is graded sufficient to ensure flow and the listance they are spaced apart, etc., depends

. Railroad structures and estimates . 6-in. and 4-in. tile drainagefor track work. French or Rock Drains. — For draining an embankment the■ French or rock drains are used to a large extent on the SantaFe. These are simply trenches filled with broken stone, 3 to 4f*. wide, ordinarily at right angles to the track and extending to I depth sufficient to drain the water pocket. Some cases extend entirely through and in other cases onlyfrom about the center to one face of the embankment. Thebottom of the trench is graded sufficient to ensure flow and the listance they are spaced apart, etc., depends Stock Photo
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Contributor:

Reading Room 2020 / Alamy Stock Photo

Image ID:

2CR88J2

File size:

7.2 MB (182.8 KB Compressed download)

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Dimensions:

1323 x 1889 px | 22.4 x 32 cm | 8.8 x 12.6 inches | 150dpi

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This image could have imperfections as it’s either historical or reportage.

. Railroad structures and estimates . 6-in. and 4-in. tile drainagefor track work. French or Rock Drains. — For draining an embankment the■ French or rock drains are used to a large extent on the SantaFe. These are simply trenches filled with broken stone, 3 to 4f*. wide, ordinarily at right angles to the track and extending to I depth sufficient to drain the water pocket. Some cases extend entirely through and in other cases onlyfrom about the center to one face of the embankment. Thebottom of the trench is graded sufficient to ensure flow and the listance they are spaced apart, etc., depends upon the locationand character of the pocket to be drained. The rock is usuallyrip-rap or one man stone, and .sometimes a longitudinal drainat the foot of the embankment is also inserted into whi<h theblind drains are connected. The co.st of rip-rap stone is usually figured at about $.2) percubic yard in place; where rock is availabl •■• -• lay be aslow as 50 cents per cubic yard in place. 256 DETAILS OF TILE DRAIN..

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