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In practice, most wood stringers are 16 inches (410 mm) in width due to limitations in milling. There are usually six stringers in a bridge. [18] Building the deck for a railroad bridge requires that a stringer lie directly beneath each rail, and that a stringer support each end of the railroad ties. Ties are usually 6 by 8 inches (150 by 200 ...
Flitch beam. A flitch beam (or flitched beam) is a compound beam used in the construction of houses, decks, and other primarily wood-frame structures. Typically, the flitch beam is made up of a vertical steel plate sandwiched between two wood beams, the three layers being held together with bolts. In that common form it is sometimes referenced ...
Tehachapi Loop. The Tehachapi Loop is a 3,779-foot-long (0.72 mi; 1.15 km) spiral, [1] or helix, on the Union Pacific Railroad Mojave Subdivision through Tehachapi Pass, of the Tehachapi Mountains in Kern County, south-central California. The line connects Bakersfield and the San Joaquin Valley to Mojave in the Mojave Desert.
The Mount Tamalpais & Muir Woods Railway was a scenic tourist railway operating between Mill Valley and the east peak of Mount Tamalpais in Marin County, California, covering a distance of 8.19 miles (13.18 km), with a 2.88-mile (4.63 km) spur line to the Muir Woods. [1] The railroad was incorporated in January 1896, and closed in the summer of ...
Sacramento Railyards. Coordinates: 38.588122°N 121.498025°W. The Sacramento Railyards (or Railyard Specific Plan) is an urban infill project of approximately 244 acres (99 ha) at the western terminus of the First transcontinental railroad in Sacramento, California. It is located between the downtown central business district and the River ...
Goat Canyon Trestle is a wooden trestle in San Diego County, California. [1] At a length of 597–750 feet (182–229 m), it is the world's largest all-wood trestle. [1] [8] [10] [11] Goat Canyon Trestle was built in 1933 as part of the San Diego and Arizona Eastern Railway, after one of the many tunnels through the Carrizo Gorge collapsed.
A purlin (or historically purline, purloyne, purling, perling) is a longitudinal, horizontal, structural member in a roof. In traditional timber framing there are three basic types of purlin: purlin plate, principal purlin, and common purlin. Purlins also appear in steel frame construction. Steel purlins may be painted or greased for protection ...
In 2008 when California voters passed Proposition 1-A, a $9.9 billion high-speed rail bond, the rail agency optimistically predicted that it could build Phase 1 of a statewide system — 520 miles ...