What is the difference between urban rail transit and traditional railway in planning and design? From the point of thought and starting point.

The traffic density is much higher than that of the big railway, and there is no skylight period during the operation, so the maintenance time can only be carried out when the car is closed at night. The equipment has strong maintainability, strong railway and high guarantee rate of complete operation of equipment. Therefore, the design of vehicles, communication, signal, public works, electromechanical and power supply should strictly follow the principle of fault-oriented safety, carefully check the maintenance planning process to ensure the reliable operation of the next day, and at the same time, the connection of passengers in case of faults and emergencies must be considered. The tunnel design should also consider the factors such as vibration and noise pollution in the city.