A precast concrete retaining wall construction element for retaining a soil mass in a railway installation or the like includes an upstanding solid face panel having the shape of a hexahedron where a rectangular front wall and an integral stem. The front wall defines an area of between about 18.75 and 75 square feet and wherein the ratio of the width of the face panel to its height is between about 0.75 to about 3.0. A reinforced element including an upward extension, an improved shear key and stacked arrangement are also disclosed.

 
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< Earthen retaining wall having flat soil reinforcing mats which may be variably spaced

< Pipe puller

> Vibratory pile driver/extractor with two-stage vibration/tension load suppressor

> Pipeline support

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