Roslagsbanan is a railroad that connects the north-eastern suburbs with the Swedish capital Stockholm. The railroad operator ordered 22 new vehicles from Stadler Rail, which had to be equipped with a Tetra-based train radio system. ErvoCom's scope of supply included 22 Central Control Units ZSE2130 with TEA1 encryption and 44 HMI CoCo2137 including accessories. In addition to the standard functionalities for voice communication, an interface to the PA- and TCMS system was also implemented. The project was realized between 2019 and 2023 and further options for additional deliveries were ordered in 2024.