Final answer:
During the Holocaust, Jews were transported to extermination camps under false pretenses and were gassed upon arrival. The smell experienced by Jews departing from the train would depend on the specific extermination camp, but there may have been a distinctive smell associated with the cremation process.
Step-by-step explanation:
During the Holocaust, Jews were transported to extermination camps in Eastern Europe. They were packed into railroad cattle-cars and taken to these camps under the false pretense that they were going to 'showers.' However, instead of being shown showers, they were sealed in and gassed.
The smell experienced by Jews departing from the train would depend on the specific extermination camp. Crematoria were often used to dispose of the bodies, so there may have been a distinctive smell associated with that process.