El Chepe takes 16 hours to complete, and runs between Chihuahua and Los Mochis, Mexico.

El Chepe, in Mexico, is one of the most famous and scenic train journeys in the world and one of the longest railways. The construction of El Chepe (The Copper Canyon route or Chihuahua-Pacific Railway) was an impressive project that took nearly 90 years to finish, and cost around $90million (£67million).

It officially opened in 1961, and it still is one of the most spectacular railway journeys, taking holidaymakers through the Sierra Madre Occidental, in Mexico, and connecting Los Mochis, on the coast, to the Chihuahua mountains. The incredible train journey features 86 tunnels and 37 bridges.

ChepeExpress said: "This region frequently serves as the backdrop for stories, films, documentaries, major newspaper articles, magazines and television networks, who come here from all over the world, attracted by the charm of the rustic countryside and the majesty of the railroad."

The most complicated section to build was the 258 kilometres (160 miles) from the Creel station in Chihuahua to Heriberto Valdez (San Pedro) in Sinaloa. "The project took enormous technical and human efforts to overcome the obstacles of the imposing Tarahumara Mountains."

The journey, which takes 16 hours to complete, can be done in a day.

According to ChepeExpress, the Chihuahua-Pacific route is one of the most "amazing and bold engineering projects, taking passengers through the canyons, great mountains, forests and ravines".

El Chepe covers about 650-670 kilometres (400 miles) between Chihuahua and Los Mochis, Mexico.

The train takes passengers through the Sierra Madre region, home to the Tarahumaras' indigenous communities, known for their traditional lifestyle and unique culture.

National Geographic explained: "El Chepe's First Class has panoramic windows, reclining seats and one on-board meal included in the train's Urike restaurant, which serves traditional dishes from the states of Chihuahua and Sinaloa; Executive Class has spacious seating and access to its own bar; and Tourist Class includes basic, but comfortable upright seating and an on-board snack service."