GKB 671 (A-GKB 90 81 0029 671-8) at Graz Köflacher Bahnhof, tender inscription. Ancient signs "Wasser-Inhalt: 8½ Cubik-Meter", "Ladegewicht Kohle 8500 kg", 671, GKB ... and a modern day UIC number which is actually quite logical: A = Austria, GKB = Graz-Köflacher Bahn, 90 = other locomotive (not electric or diesel), 81 = Austria, 0029 = Südbahn class 29 (system of 1864), 671 = number, 8 = check digit. 2018-05-01. tobias b köhler