# Spanish railway infrastructure development > Live situation record from CLSTR: https://clstr.news/situations/spanish-railway-infrastructure-development > Updated: 2026-10-25T05:00:00.000Z. Sources: 2. Developments: 2. Spanish railway authorities have initiated several projects related to rail infrastructure and environmental assessment. In Torrelavega, the state-owned company Adif launched a €128.6 million tender for a 2.1-kilometer railway tunnel designed to integrate the Santander-Oviedo metric gauge line. This project includes the construction of a new station and utilizes a ‘false tunnel’ system to incorporate tracks into the urban environment, with costs shared between Adif, the regional government, and the Torrelavega City Council. Separately, the Spanish government has tendered an environmental impact study regarding the train tunnel connecting León and Asturias. The study, valued at approximately €25,410, focuses on 8,000 hectares in the upper Bernesga basin. It aims to analyze the long-term effects on local habitats and water sources following a tunnel boring machine operation two decades ago that disrupted local springs and altered hydrological flows. ## Timeline ### 2026-10-25: Spanish Government tenders environmental impact study for León-Asturias train tunnel The Spanish government is commissioning a study to evaluate the 20-year environmental impact of the León-Asturias train tunnel on the Bernesga basin's water sources and ecosystems. 2 sources. https://clstr.news/cluster/spanish-government-tenders-environmental-impact-study-for-len-asturias-train-tunnel ### 2026-10-07: Adif tenders €128.6 million railway tunnel project in Torrelavega Adif has tendered 128.6 million euros for railway tunnel works in Torrelavega, Spain, to integrate the Santander-Oviedo line and replace the current central station. 14 sources. https://clstr.news/cluster/peru-advances-transport-infrastructure-through-private-investment --- Cite as: Spanish railway infrastructure development. CLSTR, https://clstr.news/situations/spanish-railway-infrastructure-development