3.ST263.001.04B is part of the Roztocze system, which is a railway interlocking system developed by Przemyslowy Instytut Automatyki i Pomiarów (PIAP) in Poland. It is a single-track, two-wire trackside system designed to control signaling and points operations. It is composed of two essential elements: the track-side controller, known as the Roztocze Unit (RU), and the control centre, called the Central Management Centre (CMC). The trackside controller, the RU, informs the CMC of the position of the points and signals, as well as about any malfunctions that might arise in the interlocking system. It is also used to manage the power supply for the signaling and points apparatus. The CMC is used to control the points and signaling operations for the entire system and to resolve any conflicts between the RU controllers. The 3.ST263.001.04B is a microcomputer-controlled RU which manages the power supply for the entire interlocking system, as well as the communication between the RU controllers and the CMC. It is designed to work with a wide range of train management systems and is certified by the Railway Technical Institute.