Herrenknecht AG from Schwanau is back at work on the Gotthard, years after supplying the tunnel boring machines for the world's longest railway tunnel. The Swiss authorities have commissioned the Baden-based tunnelling specialists for a new project at the prestigious site, though details on scope and machine deployment remain undisclosed. The contract signals continued confidence in Herrenknecht's boring technology for Alpine mega-projects and could involve additional infrastructure development or maintenance work on the existing 57-kilometre base tunnel.