The document discusses the Future Railways Mobile Communication System (FRMCS) project being carried out by the International Union of Railways (UIC). The project has three main work directions: defining user requirements, developing a system architecture, and investigating spectrum usage. It aims to provide a successor to the GSM-R system based on user needs. The UIC has established several working groups focused on functionalities, architecture/technology, and spectrum to help develop FRMCS. Ongoing activities include maintaining requirements specifications, delivering use cases to standards bodies like 3GPP and ETSI, defining an architecture, and investigating frequency band and migration needs. The project seeks to specify the technical conditions for a future railway mobile communication system.