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This video is of a friend model railway layout. It is T gauge. That's 3mm or 1 in 450 (1/2 the size of Z gauge)
The layout measures 600mm by 600mm and as you will see he has three trains running. It took him about six months to build. The video shows them going rather fast which is not correct they do and were travelling slowly.
Also on his layout are cars with working lights, a working garden railway, lighted buildings, working lighthouse, street light also working. Other points of interest are jetski and yachts on the lake, tennis and soccer players, a Japanese garden. There is a large number of "people" on the layout as well as the floor.
He has built some of the buildings and cars himself.