It's a Marklin Model Train Layout built by German railway enthusiasts in HO scale. The layout was created as a portable model railway layout system with four modules, each 1.6 m length x 1.6 m width. There are German locomotives and a landscape from the the 1950ies.
Actually, there are more than 250 videos about model railroading and railway modelling, for example, on Dailymotion and YouTube. Please, visit also Pilentum's Facebook site.