For those who enjoy a novelty, Noch have produced some 'Railways in a Briefcase'.

There are two for 'N' gauge and two for 'Z' gauge. Check them out here.

https://www.noch.com/en/modellbahnkoffer-interlaken-mit-marklin-spur-z-gleisen-88305.html; https://www.noch.com/en/modellbahnkoffer-serfaus-mit-marklin-spur-z-gleisen-88310.html; https://www.noch.com/en/modellbahnkoffer-st-anton-mit-marklin-spur-z-gleisen-88315.html; https://www.noch.com/en/modellbahnkoffer-berchtesgaden-mit-minitrix-spur-n-gleisen-88400.html; https://www.noch.com/en/modellbahnkoffer-garmisch-mit-minitrix-spur-n-gleisen-88405.html