TGBC

TGBC = Ffestiniog Railway Traveller's Guide with Blue Cover - Section 4 Wagons Pages 35 & 36 - Stock List as at 01-Apr-92.

A very useful reference, and one of the principal sources of the Wag(g)on lists in this wiki. Other editions of the Traveller's Guide (with different coloured covers) did not have a comprehensive stock list.