The ABP Multi-Sentry Box is an evolution of the traditional sentry box, enabling multiple automatic block posts to be concentrated within a single site, such as a station, significantly reducing maintenance along the line.
This solution is particularly advantageous in long tunnels or complex sections, as it simplifies infrastructure and centralises management.

The system introduces innovative remote joint control, eliminating the need for signal repeaters (SRs) while ensuring full functionality and system reliability.