This site is a resource that has grown over the course of 15 years from a site focusing on the metro system in Barcelona to a site called metro Planet to its current incarnation with an international scope and convenient, easy-to-use maps of urban railway systems in the world's largest cities on 6 continents.
Users will mainly appreciateUrbanRail.Net for its quick, simple maps, but the site put together by aBerlin public transportation enthusiast and historian also features practical information such as transit pricing, links, and timelines of transportation history for each rail service or line.