Todd Mintz / Snowy owl (Bubo scandiaca) sitting in the distance on snow covered railway tracks, Saskatchewan, Canada.

Daniel Heuclin / Asp viper (Vipera aspis) basking on a railway line. France, Europe. Controlled conditions.

Juergen Freund / Putting fuel into the fuel tank of a 'skate' - a local form of transport in Manila, Philippines. A motorized platform that can hold up to 30 people and runs on the railway tracks. 2008

Juergen Freund / Commuters travelling on a 'skate' - a local form of transport in Manila, Philippines. A motorized platform that can hold up to 30 people and runs on the railway tracks. When the skate meets another he...

Juergen Freund / Commuters travelling on 'skates' - a local form of transport in Manila, Philippines. A motorized platform that can hold up to 30 people and runs on the railway tracks. When the skate meets another hea...

Juergen Freund / Commuters travelling on a 'skate' - a local form of transport in Manila, Philippines. A motorized platform that can hold up to 30 people and runs on the railway tracks. When the skate meets another he...

Juergen Freund / View of the railway lines from a 'skate' - a local form of transport in Manila, Philippines. A motorized platform that can hold up to 30 people and runs on the railway tracks.

Martin Dohrn / Ruhr Valley with roads, railway tracks and overhead pylons, Germany

Tony Evans / Rosebay willowherb growing by railway line {Chamerion angustifolium angustifolium} Scotland, UK