The development itself doesn't prevent a future rail revival as long as a protected corridor through the site is retained. At least under light rail rules, total segregation is not necessary and new road crossings at grade are permitted, but as little interrunning with general road traffic as possible is still highly desirable for speed and reliability....I find it incredible that the Welsh Government draw up all these Metro plans - including a new line from Caerphilly to Newport, yet do nothing about protecting such a route from development. (Clearly, a line from Caerphilly to Newport station would significantly benefit the populous of the Rhymney valley by taking a ‘short cut’ to the main line for services to/from England instead of going via Cardiff. The line is stallion place as far as Machen Quarry).