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On 8 July 2025, a key meeting was held at ČMŽO - elektronika, Přerov, with the representatives of ČMŽO - elektronika, ANGELSTAR, Siemens Mobility and TRAMECo Systems. ANGELSTAR, a joint venture between Stadler and MERMEC, is with its GUARDIA system another OBU ETCS manufacturer entering the Czech market.
On 13 January 2023 Stadler announced that it has won a Europe-wide tender to retrofit up to 80 special vehicles of DB Netz for infrastructure inspection purposes with the GUARDIA ETCS OBUs.
On 18 June 2020 it was announced that GUARDIA, the ETCS on-board unit produced by AngelStar, has been homologated for the first time for use on the Koleje Mazowieckie FLIRT EMUs.