Metra rail system, station sign in the style of the Paris Metro, Chicago, Illinois, United States of America, North America

The Metro light rail line on the The Dom Luís I Bridge and the Walls of Dom Fernando (Fernandine Walls), Douro River, Porto, Norte, Portugal, Europe

The Dom Luis 1 Bridge over the River Douro showing Porto Metro light rail in transit and Arrabida Bridge in background, Porto (Oporto), Portugal, Europe

The Dom Luis 1 Bridge over the River Douro showing Porto Metro light rail in transit and Arrabida Bridge in background, Porto (Oporto), Portugal, Europe

LUAS urban public transport light rail tram system, city of Dublin, Republic of Ireland, Europe

Metro Light Rail on Washington Avenue, Phoenix, Arizona, United States of America, North America

A London Underground sign at Kings Cross, London, England, United Kingdom, Europe

Modern metro station "Crystal City", Washington DC, USA, America

Metro, U-Bahn, U1 on Oberbaumbruecke bridge across the Spree river at dusk, Friedrichshain-Kreuzberg quarters, Berlin, Germany, Europe, PublicGround

Luas Bridge At Dundrum In Dublin, Ireland