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Light rail and Metro definition

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These two methods are not scientific, the main difference lies in whether it is light rail or subway, can be built on the ground, ground or viaduct; although the subway is generally more than light rail, but in order to enhance the stability of the track, reduce maintenance and repair work, increase the return section and reduce the stray current, subway and light rail will tend to choose heavy rail. The basis of dividing the two is the size of the maximum peak hour traffic flow. Subway can adapt to the maximum peak hour traffic flow of 3-6 million passengers, light rail can adapt to the maximum peak hour traffic flow of 1-3 million. This design of the subway and light rail, the difference between their first performance in the subway load is generally greater than 13 tons, and the light should be less than 13 tons, secondly, under normal circumstances, the plane curve radius of the MTR is not less than 300 meters, and the light is normally 100 meters to 200 meters, in addition, the number of subway train marshalling each also than the light rail vehicles are more quota. From the transport capacity, vehicle design and construction investment, etc., the light rail and subway are different. In fact, the difference between the final analysis, or the essence of the difference between the volume, the subway line in the peak hours, the one-way transport capacity of 30 thousand to 70 thousand passengers, while the capacity of the light rail to 20 thousand passengers. The volume size determines the number of groups (metro train, up to 4-10, light rail train marshalling section 2-4), determines the vehicle to determine the axle load to determine the length of the site (important, involves the reserved land, underground station area directly related to the cost, so the passenger flow forecast). According to international standard, the difference between the two is divided into three types: B, C and A, which are 3 meters, 2.8 meters and 2.6 meters respectively. All of the track traffic line called A or B train line is called the subway, the use of the 8 ~ 5 section of the train; the use of C type of rail transit line is called the light rail, the use of 2 ~ 4 section of the train, the train of the vehicle and the formation of the axle weight. The subway is not limited to this form in the underground tunnel in the operation line, but refers to high specification electric passenger train at peak hour one-way transportation capacity in 30 thousand to 70 thousand large capacity city rail transportation system. Operating line diversification, underground, ground, elevated three organic combination. Many domestic and foreign cities have used "rail transit" instead of "Metro" this traditional name.

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