What could the people smell when they got off the transport?

When they exited the train, the people were hit with a barrage of smells. From within the train car smells of a car, overcrowded with people, defecation, urine and even bodily odor. Possibly even the smell of dying and/or decaying people, who did not make it to the final destination. Then the smells of the outdoors, something they have not been able to smell in a long time. The air, the earth, the grass. Then there was the smell from the came itself. The smell of the furnaces, with was a mixture of fire and burning flesh. The smell of over worked, emaciated people. The smell of death, and despair would have hung heavily in the air, as they unloaded from the train.

Eliezer, along with the other Jews of Sighet, has been transported by cattle train to Birkenau, the reception center for the notorious Auschwitz death camp. The journey is long and hard with appalling conditions for everyone on board. What makes it even more unbearable is that one of the Jewish prisoners, Madame Schaechter, goes completely insane, constantly screaming in terror at the visions that torture her rapidly disintegrating mind.
In her nightmarish premonitions, Madame Schaechter sees hellish visions of fire and furnace. It's only when they finally arrive at Birkenau that the other prisoners realize to their horror just how disturbingly accurate Madame Schaechter's premonitions really are. Through the windows of the train, it's possible to see chimneys belching thick clouds of acrid smoke into the atmosphere. All around is the revolting stench of death, the stench of burning flesh coming from the furnaces used for the disposal of dead bodies.