"Etihad Rail, the developer and operator of the UAE National Rail Network, has announced signing a strategic partnership with Herrenknecht, one of the oldest and largest companies specialised in tunnelling solutions, to develop new tunnel design and construction technologies"

from https://ajot.com/news/etihad-rail-signs-strategic-agreement-with-herrenknecht-to-develop-new-tunnel-design-and-construction-technologies