Reply To: Ishihara Colour Vision 24 or 38? Home › Forums › Rail Standards › Ishihara Colour Vision 24 or 38? › Reply To: Ishihara Colour Vision 24 or 38? August 11, 2025 at 9:59 am #485 maroomsParticipant Network rail have issued permission to use 24 plate and permit 2 errors from the first 13 plates. It is permitted to fail 3 plates from the first 17 plates of the 38 plate edition.
