Why are some city railways called light rail? What is heavy rail?
At present, the passenger flow of Shanghai's largest public transport facilities, Rail Transit Pearl Line: date of traffic was 729 thousand people, namely the peak stage of one-way traffic of 20 thousand and 400 passengers per hour; forward (to 2020) the daily traffic of 914 thousand passengers per hour, is the peak stage of one-way traffic of 51 thousand and 500 passengers. The train formation is 6, the train running time is 5.5 minutes, and the forward time is 2.1 minutes. Therefore, the Pearl Line of rail traffic should not be called "light rail" strictly, but should belong to Metro system.
Heavy rail is larger than light rail cross section and can bear more force. The early line railway, as well as the use of 38 kg of rail, now is the use of 50 kg and 60 kg."Subway", "light rail" do not confuseRail transit to adopt medium passenger volume, can adapt to the long-term one-way maximum peak hour, passenger flow 1.5 - 30 thousand passengers become light rail. If the large passenger carrying two cars, can adapt to the long-term one-way peak hour, passenger volume of 3 - 60 thousand passengers collectively referred to as the subway.
The rail is divided into two kinds of heavy rail and light rail. The rail specification is expressed by the nominal weight per meter.Heavy rail: the nominal weight of more than 30 kg per meter, rail belongs to heavy rail, heavy rail is divided into general rail and crane rail two. General rail means rail laying, dedicated lines, bend and tunnel rails. Among them, the standard track length is 12.50 meters and 25 meters in two, the laying of the curve rail, slightly shorter length, 12.46 meters, 12.42 meters and 24.96 meters, 24.92 meters and other rail, general specification for 38, 43, 45, 50, 60 (kg / m).
