As part of the Holocaust commemorations this week, Professor Mark Roseman uses rare personal and official documents to retrace the final journey of Ernst Krombach and his family, German Jews deported from Dusseldorf to Lublin in Poland in the spring of 1942. Their train left the station on time... and that punctual beginning of their journey to the concentration camp was indicative of a much longer bureaucratic journey for the Nazi regime as it organised the expulsion and execution of millions of its citizens. Along the route to Lublin, Roseman examines the chillingly precise machine that made a system out of slaughter.