books?id=gY_o6_7TP98C&pg=PA9&lpg=PA9&dq=%22Carl+Bergmann%22+Reichsbahn&source=bl&ots=c8HUQYq99W&sig=sehulsqVkbueWdvmorZVMgx4NBM&hl=nl&sa=X&oi=book_result&resnum=1&ct=result
books?id=gY_o6_7TP98C&pg=PA9&lpg=PA9&dq=%22Carl+Bergmann%22+Reichsbahn&source=bl&ots=c8HUQYq99W&sig=sehulsqVkbueWdvmorZVMgx4NBM&hl=nl&sa=X&oi=book_result&resnum=1&ct=result