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The name "L-girder" comes from the principal horizontal members in this type of benchwork construction. The L-girders are assembled by attaching the side of one piece of lumber to the edge of another (usually by glueing). The girders are held together with clamps or screws until the glue dries. Viewed from the end, an L-girder makes the shape of a letter "L". However, when the L-girder is incorporated into the construction, the "L" is upside down. (This way the the "flange" is on the top, making it easier to attach additional crosspieces to the top of the girder.) As Ray indicates, most model railroad benchwork is built with 1" (nominal) lumber. A typical L-girder is built by attaching the side of a 1 X 2 "flange" to the (top) edge of a 1 X 4 "web." The resulting girder is much more rigid than would be a plain 1 X 4 board. --John
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