The Signalling and Telecommunications Technology Division (hereinafter referred to as "STTD") is now promoting research and development on low-cost and high-performance signalling systems and application of general-purpose telecommunications technology to railways. This special edition on signalling and telecommunications technology highlights the computer and microwave balise aided train control system (COMBAT) that uses radio for train detection and several other research results. This report introduces other systems that have been developed in recent years, but not included in this edition.