This may refer to a c1900 state, but E L Ahrons, who saw the locos in the flesh c1890, explicitly says that the frames were green. (Ahrons, Locomotive and Train Working in the Nineteenth Century, Vol 6, p.57). The GNRI, prior to 1914, certainly did have a livery scheme with lined green uppers and darker coloured frames - described by Ahrons as ‘claret’ (p.70).