The Narrow Gauge Railways of Wales No. 2 (Ninth edition) is part of R. W. Kidner’s classic Light Railway Handbooks series, offering a detailed historical and technical study of Wales’ narrow-gauge railway network.

It focuses on lines built for industrial and rural transport—especially slate and mineral railways—describing their routes, operation, locomotives, and development over time. The book is largely based on historical records and photographs, making it a key reference for railway historians and enthusiasts interested in Welsh narrow-gauge heritage.