Goat Canyon Trestle is a wooden trestle in San Diego County, California. At a length of , it is the world's largest all-wood trestle. 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. The railway had been called the "impossible railroad" upon its 1919 completion. It ran through Baja California and eastern San Diego County before ending in Imperial Valley. The trestle was made of wood, rather than metal, due to temperature fluctuations in the Carrizo Gorge. By 2008, most rail traffic stopped using the trestle. Background Under the direction of John D. Spreckels, construction of the San Diego and Arizona Eastern Railroad began in 1907. It was backed by Edward Henry Harriman at the urging of President Theodore Roosevelt. Engineers called the route "impossible" as it crossed the Colorado Desert and through the Jacumba Mountains. In 1919, the railroad was completed, connecting San Diego with the Imperial Valley, by way of Mexico. Before the construction of the railroad, the only rail connection to San Diego was from the north, via Los Angeles, which was only completed in the late 19th century. The new railway provided a connection to the Southern Pacific Railway, instead of going north on the Atchison, Topeka and Santa Fe Railway. At the opening of the railway, and prior to the construction of the Goat Canyon Trestle, the most significant bridge on the route was the Campo Creek Viaduct, which is long and high above the ground. The San Diego and Arizona Railway experienced a series of difficulties, including collapsed tunnels and rock slides, which led to the periodic closure of the railroad. One such difficulty was the collapse of Tunnel 15 in March 1932; it had been caused by an earthquake. Its remnants can still be seen today. History Designed by Chief Engineer of the San Diego and Arizona Railroad, Carl Eichenlaub, it was built to common standard drawing CS-33 standards. The trestle was built in response to the collapse of Tunnel 15. According to the original plans, the trestle would be long, and high. Construction began in 1932. Sections of the trestle were assembled at the bottom of the canyon, then lifted into position. Redwood timber, the same type used for railroad ties along the rest of the route, was utilized because Carrizo Gorge's considerable