 By 1973 the last unmodernised locomotives had been retired from duty.Locomotives 99 535 (Dresden Transport Museum), 99 579 (Museum Rittersgrün) und 99 604 (DGEG, today SSB Radebeul), still in their original design, were secured for museum purposes.The retirement of the reconstructed locomotives did not begin until the mid-1970s, starting with those engines that still had their original rivetted frames.