Development · Status quo · ForecastERTMS development started in 1989 in the context of plans for a European high-speed railway network. In its 20th year there are no more doubts about the key role of ERTMS for the revitalisation of the European railways. This new standard work gives an introduction to ERTMS and an overview of the current status, including the consolidation which will follow the formal adoption of new baselines for the ETCS and GSM-R specifi cations.This compendium offers a complete guide to the complex ERTMS concept, giving an overview on all relevant sub-projects. Its aim is to assist the work of all parties and people engaged in the wider roll-out of ERTMS for the benefi t of safe, efficient and sustainable rail transport.