'The Railway - British Track since 1804' a hardback 459 page title by Andrew Dow (ISBN 1473822572) w w w dot pen-and-sword.co.uk
features (on page 258) a Karrier road rail vehicle operated by the LNER between Bridge of Orchy and Tulloch on the Sc Region, amazingly dating from 1934 (Karriers Ltd of Huddersfield - fleet number KE6001) used for permanent way work in this remote area.
Historically wise, was this the very first Road Railer ??