What are the three major systems and three major equipment of urban track transportation?
There are many types of urban trajectory traffic and great differences in technical indicators. There are different evaluation standards and no strict classification in the world. Due to the rapid development of urban rail transit in the world scale, different regions, countries and cities, and unequal service objectives, the development of rail transit teaching equipment has become a variety of types. At present, there is no very unified classification standard. Different classification methods can distinguish different results.
According to capacity (transportation capability), it can be divided into high capacity, large capacity, medium capacity and small capacity.
According to the guidance method, it can be divided into wheel rail guidance and guide rail guidance.
If the line is erected, it can be divided into underground, elevated and above ground.
If the line is isolated, it can be divided into full isolation, semi isolation and non isolation.
According to the track material, it can be divided into steel wheel rail system and rubber wheel concrete track beam system.
According to the traction method, it can be divided into rotary DC, AC motor traction and linear motor traction.
According to the operation organization method, it can be divided into traditional urban track traffic, regional fast track traffic and urban (suburban) railway.