I was extremely fortunate to have been able to have a "flight" in one of these recently. The volunteers at the Nhill Aviation Heritage Centre in Victoria, Australia have a working Link trainer that they have restored, including replacing all the instruments with working ones. They even had the map table which had a robotic shuttle of sorts that when working (this part had yet to be restored to a working state) would track with the pilot's movements over a map, drawing the course taken on the map with a wax pencil. Absolutely remarkable for a completely analogue system!