Russia´s First High Speed Train Sapsan, Moscow To St. Petersburg

The term light rail is sometimes used for a modern tram system, but it may also mean an intermediate form between a tram and a train, similar to a subway except that it may have level crossings. These are then usually protected with crossing gates. In US terminology these systems are often referred to as interurban, as they connect larger urban areas in the vicinity of a major city to that city. Modern light rail systems often use abandoned heavy rail rights of way (e.g. former railway lines) to revitalize deprived areas and redevelopment sites in and around large agglomerations.
• Monorail
Monorail was developed to meet medium-demand traffic in urban transit, but represents a relatively small part of the overall railway field.