Xi’an Railway in China is 505 kilometers (313.7 miles) long. It was completed in 2008, but it will not be open for use until 2010. It crosses the Wei River twice.
The longest accessible bridge in the world is the Lake Pontchartrain Causeway. It consists of two parallel bridges that cross Lake Pontchartrain in Southern Louisiana. The longer bridge is 23.87 miles long!
It depends on how strict your definition of a “bridge” is. Technically speaking, the Weinan Weihe in China and the Bang Na in Bangkok are both longer than the Lake Pontchartrain Causeway, but both the Weinan Weihe and the Bang Na are more commonly considered viaducts because their surface doesn’t cross over water for a long enough distance to be considered a true bridge. If we are to define bridges as strictly covering water for the majority of their distance, the Lake Pontchartrain Causeway in Louisiana, measuring at 23.87 miles, would be considered the current record holder. However, China announced their plans to begin building a “Y” shaped bridge to connect Hong Kong, Macau, and China, which would measure approximately 31 miles. This would make China the new official record holder upon completion, which is expected in 2015.
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