This seems to be an early caravan – although much larger – affixed upon an army carriage dating back to WWI (although the Beatles were playing on the interior radio when we visited). I thought it might have travelled on rails – and think it could travel on a number of different surfaces (the wheels look rail-based – but I might be wrong). Basically, workmen tasked with building or clearing, etc, in remote areas – could live in these types of devices for extended periods – between shifts. This was when labour Unions ruled the roost and this type of relative luxury was demanded! I suspect for many workers this temporary accommodation might be better than the places they actually lived in! It reminded me of the carriage Lenin spoke from when he declared the end of capitalist exploitation in 1917! A left-leaning Labour government improved the lives of millions in 1948!