River Kwai train crossing the Wampoo Viaduct on the Death Railway above the River Kwai valley near Nam Tok, Kanchanaburi, Thailand, Southeast Asia, Asia

River Kwai train crossing the Wampoo Viaduct on the Death Railway above the River Kwai valley near Nam Tok, Kanchanaburi, Thailand, Southeast Asia, Asia

The Himalayan Queen toy train crossing a viaduct, on the Kalka to Shimla Railway, UNESCO World Heritage Site, Northwest India, Asia

The Himalayan Queen toy train crossing a viaduct, on the Kalka to Shimla Railway, UNESCO World Heritage Site, Northwest India, Asia

A view of the River Tamar at Calstock, with a railway viaduct crossing it, on the Devon-Cornwall border, Cornwall, England, United Kingdom, Europe

A view of the River Tamar at Calstock, with a railway viaduct crossing it, on the Devon-Cornwall border, Cornwall, England, United Kingdom, Europe

Aerial of a Train crossing the Brusio spiral viaduct, UNESCO World Heritage Site, Rhaetian Railway, Switzerland, Europe

Aerial of a Train crossing the Brusio spiral viaduct, UNESCO World Heritage Site, Rhaetian Railway, Switzerland, Europe

The Bernina Express crossing the Wiesen Viaduct in the Swiss Canton of Graubunden, Switzerland, Europe

The Bernina Glacier express that goes from Chur in Switzerland to Tirano in Italy, crossing the famous Landwasser viaduct, Graubunden, Switzerland, Europe

A workman stopping construction traffic where the railway crosses a road at a High Speed rail link being constructed between Antequera and Granada in Andalucia, Spain, Europe

Glacier Express, crossing the Landwasser Viaduct near Filisur, Graubuenden, Switzerland

Train, Glacier Express, crossing the Landwasser Viaduct near Filisur, Graubuenden, Switzerland

Train, Glacier Express, crossing a viaduct on the Albula line, Albula Valley, Graubuenden, Switzerland

Train, Glacier Express, crossing the Landwasser Viaduct near Filisur, Graubuenden, Switzerland

Train, Glacier Express, crossing the Landwasser Viaduct near Filisur, Graubuenden, Switzerland

Train, Glacier Express, crossing the Bugnei Viaduct in Surselva, Graubuenden, Switzerland

Train crossing a viadukt under blue sky, Guarda, Grisons, Switzerland

RhB, Rhaetian Railway train crossing the Landwasser Viaduct near Filisur, Albula section, Filisur, Graubuenden, Switzerland, Europe

RhB, Rhaetian Railway train crossing the Landwasser Viaduct near Filisur, Albula section, Filisur, Graubuenden, Switzerland, Europe

Hoellentalbahn crossing the Ravenna viaduct in Hoellental valley near Hinterzarten, Black Forest, Baden-Wuerttemberg, Germany, Europe

RhB, Rhaetian Railway train crossing the Landwasser Viaduct near Filisur, Albula section, Filisur, Graubuenden, Switzerland, Europe

RhB, Rhaetian Railway train crossing the Landwasser Viaduct near Filisur, Albula section, Filisur, Graubuenden, Switzerland, Europe

Subway on the Oberbaumbruecke bridge crossing the Spree River, Fernsehturm, Television Tower, Berlin, Germany, Europe