Let's go cab riding into a model train station, underground. It's a model train layout built by a German railway enthusiasts in HO scale. The tracks in the underground are called shadow station, fiddle yard or staging yard. This is the non-visible area in the underground. The model railway tracks in the staging yard have a total length of 275 meters.
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.