We have made an inventory of ERTMS alternatives. ETCS Light can include, for instance, a mechanical box on wheels (On-board unit) with a standardised train interface. Owners can place this box in their vehicles and connect it when the vehicle is to run over an ERTMS track section. This on-board unit is a promising alternative. IEMeV will develop this product if there are enough buyers, if there is a positive business case and if we can work together with other European parties.