The system that controls the switches, routes, and signals within a station and implements interlocking between them is called the station signal interlocking system. The station signal interlocking system is an important technical equipment that ensures the safety of train operations within the station, provides railway transportation efficiency, and improves the working conditions of train personnel.

The HHLS-I computer interlocking system is an enhanced interlocking control system developed based on the RTP bus. The system technology is mature, with high security and reliability. The system adopts a new dual machine hot standby structure of "dual security drive", which completely separates the primary and backup machines, and improves the system's self checking ability, availability, reliability, and security; The system adopts a unique software and hardware dual machine hot switching logic circuit, which enables the dual machine hot standby system to achieve "disturbance free switching" not only in the autonomous state of the system, but also in the non autonomous state (such as in the case of damage to the central processing unit or power supply of the host). The system adopts a modular structure, fully meeting the requirements of stations of different scales, system upgrades, and external interfaces.