SiO Signalteknik provides consultancy services to the railway sector, with a focus on signalling systems and traffic control. Its service offering includes design, internal and safety reviews, commissioning inspections, site supervision (BPU), assessment, Factory Acceptance Testing (FAT), and training services. The company is a well-established player with long-standing client relationships and recurring assignments. Founded in 2011, SiO is headquartered in Hedemora and has local offices in Borlänge and Gothenburg. The company has 14 employees and generated revenue of approximately SEK 22 million in 2025.

"We are very pleased to welcome SiO Signalteknik to XPartners. The company adds specialist expertise in an attractive niche area and strengthens our offering within the railway sector in a very good way," says Magnus Trollius, Managing Director of XPartners Sweden.

The company operates across Sweden and has experience from projects in, among other locations, Nyköping, Hallsberg, Sundsvall, Uppsala, Björkliden and Kiruna.

"Through XPartners, we gain new opportunities for collaboration and knowledge-sharing with other specialist companies. This supports our continued development and strengthens our offering to clients within railway infrastructure," says Hans Holmberg, CEO of SiO Signalteknik.

About SiO Signalteknik
SiO Signalteknik is a Swedish technical consultancy within railway infrastructure, specialising in signalling systems and traffic control. Founded in 2011, the company is headquartered in Hedemora and has local offices in Borlänge and Gothenburg. SiO provides services including design, internal and safety reviews, commissioning inspections, site supervision (BPU), assessment, Factory Acceptance Testing (FAT), and training services.