Just found the old book (Heeresfeldbahnen, Alfred B. Gottwaldt, 1986), the book claims three Brigadelok 0-8-0 were shipped to USA after 1965, the locos being Maffei 4613/1915; Hartmann 4140/1918 and Jung 2845/1918. The last one, the book says, went to "Zoo Chicago". They were outside-frame machines, so maybe some heavy modifications were done by new owners. Their previous owner was a coal mine near Cologne, where they supposedly saw some very heavy use and might have been in a very bad condition.