I read about this place a while back. From what I can see online, work on the ground has already started.
It does seem to have its critics who question it's use to the rail industry in the UK▸ as it isn't located particularly closely to any of the major rolling stock assembly centres. It does however have a link to the national rail network, is close to Swansea docks and will have viable road access through the upgrade of the Head of the Valleys A Road.
They also seem to have European railway companies in their sights as potential customers.
I think that I might try and follow this a bit more.
Plenty of stuff gets lugged from all over Europe to Velim in the Czech Republic doesn't it? Can't be that much grief to stick it on a ship/low-loader, particularly if you can then run it 24/7/365 without annoying anyone other than a few sheep.
Plenty of engineering expertise in that next of the woods, definitely good for testing waterproofing and winterisation, might not be so good for testing extreme heat though ;-)