1 Atlas of locomotives, Part I., Ing. Jindřich Bek. Ing. Karel Kvarda,  Nadas 1970 The railway society Liberecko-jablonecko-tanvaldská dráha bought three locomotives, G21,G22,G23 (Floridsdorf 1901) for our second normal gauge cog railway (Abt’s system) from Tanvald to Kořenov, opened on June 1,1902. 2 Atlas lokomotiv II., Ing. Jindřich Bek. Ing. Karel Kvarda, Nadas 1970 The technical condition of the steam locomotives (series 404.0) on the railway from Tanvald to Kořenov deteriorated substantially. The original decision to electrify the railway was overridden by the decision to motorize it. 3 Eisenbahn im Sudetenland, Siegfried Bufe, Heribert Schröpfer Bufe-Fachbuch-Verlag, Egglham, ISBN 3-922138-42-x Part: Errinerungen an unseren Reichenberg - Gablonz - Tannwalder Eisenbahn 1910 - 1940 4 Horské dráhy světa (Mountain railways of the world), Josef Hons, Nakladatelství dopravy a spojů Praha 1985 Rigi and Riggenbach, The pupil and the teacher, the cog, the cog wheels and the brakes, up to the Isera mountains. 5 Lokomotivy řady 404.0, Ing. Radko Friml, NADAS - AFGH s.r.o. Praha 1992 ISBN 80-7030-176-7 I recomend you this paperback -full of information about this cog railway. Lot of pictures, technical data and drawings, very intersting reading 6 1902 - 2002 100 let trati Tanvald Kořenov Harrachov, Václav Haas a kol., SAXI Praha 2002 the brochure issued at the occasion of 100 year anniversary 7 1902 - 2002 100 let trati Tanvald Kořenov Harrachov, Václav Haas a kol., SAXI Praha 2002 the reprezentative book  issued at the occasion of 100 year anniversary 8 Die Zackenbahn Hirschberg-Schreiberhau-Grünthal/Polaun,  Klaus Christian Kasper, Verlag Klaus Christian Kasper Bonn, 2002, ISBN 3-930567-17-2 the memory of the Prussian highest mountain railway