|the original 1872 bridge, a 1911 postcard|
The highest railroad bridge in North America at 430 feet (131 metres), the Metlac River bridge was part of a 1980s upgrade to the entire Mexico City-Veracruz line that included several other high bridges such as the Vaqueria Viaduct and the Atoyac Bridge.
The modern Metlac Railway Bridge is a prestressed concrete beam bridge with 2 railway tracks. The original 1972 highway bridge is parallel to the railroad bridge and is just a few feet lower. The original 1872 Metlac bridge was the most famous railway bridge in Mexico for decades, curving 92 feet (28 metres) above the river. Now abandoned, it can be seen from the higher bridges. (highestbridges.com)