The reason why 6502 electric centralized system is adopted by most railway stations at present is that it has many advantages that other systems do not have, such as the double-button route selection mode adopted by 6502 electric centralized system, which is intuitive, simple and not easy to make mistakes; Almost all sets of relay circuits are spliced by fixed combination, which makes the engineering design simple, the construction period short and easy to maintain, and is also beneficial to the modification of the station reconstruction. Of course, there are also some problems that need to be improved in 6502 electrical concentration.

For example:

(1) When the signal is turned on, the signal light is broken. If you want to turn on the guidance signal after the train approaches, you must manually unlock it and wait for 3 minutes before guiding the train.

(2) After the signal is turned on, if a switch section fails in the route, the track relay loses excitation and falls, and the route cannot be unlocked, so it can only be unlocked after the fault is repaired;

(3) Once some protection paths in the 6502 electric centralized circuit are disconnected, they can't be found during normal operation, and they can't play a protective role again after disconnection. The first two items affect efficiency, and the latter one is not conducive to safety, both of which need to be improved.