What is the difference between rail transit and subway

The difference between rail transit and subway: rail transit, also known as light rail, describes the passenger capacity is small, fast-moving rail transportation, light rail has its own operating track, but does not necessarily have to be isolated from other vehicles on land (such as streetcars, light rail); subway passenger capacity, high-speed operation, independent (isolated) from the other means of transportation of rail transportation.

Rail transit is a class of vehicles or transportation systems in which operating vehicles are required to travel on specific tracks. The most typical type of rail transit is a rail system consisting of conventional trains and standard railroads. With the diversification of train and railroad technology, rail transportation presents more and more types, not only spread in long-distance land transportation, but also widely used in short and medium distance urban public **** transportation.

Subway is a form of rail transportation, refers to the operation of the main underground urban rail transit system, that is, "underground railroad" or "underground railroad" (Subway, tube, underground) abbreviation. Many of these systems may be converted to at-grade or elevated sections outside of city centers in order to fit the built environment and to take into account construction and operating costs. The subway is an exclusive, high-density, high-capacity urban rail transit system that covers a variety of underground and aboveground rights-of-way in urban areas.