The world's first commercially available private luxury train, this "palace on rails" spans 1,312ft (400m) and comprises 14 cars, with space for 18 passengers.

It rocks an incredible glass casing that switches from transparent to opaque, as well as a series of unbelievable spaces including a garden and an art gallery. There are even wings that fold down to create alfresco terraces.

The handiwork of Steve Jobs' yacht designer Thierry Gaugain, the G Train is envisaged as a green alternative to a private jet or superyacht. It could become the ultimate status symbol for the eco-conscious billionaire.

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