Tågbyggnadsverket

Tågbyggnadsverket, often abbreviated as TBV, was a Swedish government agency responsible for the planning, construction, and maintenance of railway infrastructure in Sweden. Established in its final form in 1988 through the merger of Statens Järnvägar's (SJ) construction department and Vägverket's railway division, its mandate was to ensure the continued development and operational capacity of the national rail network.

The agency's primary tasks included the modernization of existing lines, the construction of new railway tracks, and the implementation of advanced signaling and safety systems. TBV also played a crucial role in electrification projects and in ensuring the accessibility and usability of the rail network for both passenger and freight transport. Its work was vital for Sweden's transportation policy, aiming to promote sustainable and efficient travel.

In 2010, Tågbyggnadsverket was dissolved and its functions were largely transferred to Trafikverket, the Swedish Transport Administration, which now oversees all modes of public transport infrastructure in the country. This reorganization aimed to create a more integrated and streamlined approach to national infrastructure management. The legacy of TBV, however, can be seen in the extensive and well-maintained railway network that continues to serve Sweden.