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In fact, it's just a footpath. OpenStreetMap puts it at 1.2 km in length, and it's all downhill from Saig. A 165 m drop to be precise, which means an average gradient of nearly 14% - that is steeeep with four Es. In the winter, it should be covered in snow, and, with its four turns, you'd figure it would be a really cool route for tobogganing...
Well, that's what a Rodelbahn is, it's a sled/luge/toboggan track! If you look up the term, you'll come across summer Rodelbahns which are rides on rails (little roller coasters, I've seen one next to the Arzviller boat lift that I'll probably talk about one day, and the Bobbahn is a cracking bobsleigh-style ride at Europa-Park), but this is a natural Rodelbahn. Which runs on a hiking trail, so a few rules need to be laid out, such as pedestrians should hug the inside of the corners.
Most of the trail is in the forest, but once (if!) you reach the final stretch, the ride into Titisee with this view of the lake must feel incredible.
Notice on the left that the base of a pole has got some padding around it... That's not (just) for visibility in the snow! If you can zoom in that far, you might notice that the walls of the bridge at the bottom are padded too.
You'll probably be thinking "again!" once you've reached Titisee, but, as we joked with my sister, that "again!" won't come soon - you've got a long, steep climb back up to Saig first! Those numbers, 1.2 km and 14% gradient, aren't so amusing when starting from the bottom... And the train from Titisee to Schluchsee mentioned yesterday doesn't stop at Saig! XD