Cardiff pioneered this at a Championship level - they actually allowed home fans to stand behind their seats behind the goal for a couple of years when this was officially banned in England. They then installed rail seats as and when they could afford them.
Rail seat are far more expensive than ordinary seating - but the Riverside has an issue where large swathes of seats need replacing, particularly lower down in the stadium where they have been struck by footballs in the warm ups. At Stoke, a similar stadium to the Riverside but a couple of years younger, they have recently replaced much of the seating but not with rail seats.
But this will be the best time to install rail seats when we need new seats.
Rail seat are far more expensive than ordinary seating - but the Riverside has an issue where large swathes of seats need replacing, particularly lower down in the stadium where they have been struck by footballs in the warm ups. At Stoke, a similar stadium to the Riverside but a couple of years younger, they have recently replaced much of the seating but not with rail seats.
But this will be the best time to install rail seats when we need new seats.