Sheffield trams (Supertram) approaching a stop in Church Street, Cathedral Quarter, Sheffield, Yorkshire, England

Sheffield tram (Supertram) on overhead track approaching Commercial Street from Park Square, Sheaf Valley Quarter, Sheffield, Yorkshire, England

Sheffield tram (Supertram) approaching a stop in Church Street, Cathedral Quarter, Sheffield, Yorkshire, England

Sheffield Railway station seen from the east with Supertram stop in foreground and city centre behind, Granville Street, Sheffield, Yorkshire, England

View of bullet train in Kanazawa Station, Kanazawa City, Ishikawa Prefecture, Honshu, Japan

View of trains from the Lotus Tower, Colombo, Sri Lanka

View of trains from the Lotus Tower, Colombo, Sri Lanka

Avanti West Coast Pendolino train and class 320 train in background, Central Station, Glasgow, Scotland, United Kingdom, Europe

Punhung station, one of the many 100 metre deep subway stations on the Pyongyang subway network, Pyongyang, Democratic People's Republic of Korea (DPRK), North Korea, Asia

Intercity-Express ICE train, fastest on the network, on Hohenzollern railway bridge, Cologne, North Rhine-Westphalia, Germany, Europe

A blur of trains arriving and leaving London's Waterloo train station at dusk during rush hour.

Zoom view of trains leaving London's Waterloo train station.

View of London's Waterloo train station.

View of London's Waterloo train station.

Intercity-Express train, ICE, and a regional train, suburban train, on the track, railway, track network next to the main railway station in Essen, Essen, North Rhine-Westphalia, Germany, Europe

Double-deck train, regional train, on the track, railway, track network next to the Essen main railway station, Essen, North Rhine-Westphalia, Germany, Europe

ICE, Intercity-Express train on the track, railway, track network next to the Essen main railway station, Essen, North Rhine-Westphalia, Germany, Europe

DEU, Federal Republic of Germany, Hamburg: German Railway, tracks at Hamburg main railway station.

Suburban train on the track, railway, track network next to the Essen main railway station, Essen, North Rhine-Westphalia, Germany, Europe

ICE, Intercity-Express train on the track, railway, track network next to the Essen main railway station, Essen, North Rhine-Westphalia, Germany, Europe

High angle view of empty parallel electric railroad tracks, California