Vronsky follows the conductor into the car, looking for his mother.
On his way in, a woman walks past him. She merits a second glance because of the expression on her face. She's tender, sweet, beautiful, and radiates life.
Vronsky finds his mother, the Countess Vronsky, and while he talks to her, he eavesdrops on the woman who just passed him.
He realizes that it's Anna, Oblonsky's sister and Karenin's wife.
Vronsky helps her find Oblonsky.
After Anna finds her brother, she comes back to say good-bye to the Countess. The two of them had been chatting about their sons during the entire train ride from Petersburg. Anna has an eight-year old son, Seryozha, whom she's never left behind before.
The Countess tells Anna that she has fallen in love with her.
Vronsky makes small talk with his mother, and they prepare to leave the station.
Their departure is interrupted by a commotion. A guard was drunk and didn't hear the train; he was run over by the car.
Vronsky and Oblonsky see the body and tell the women that the guard's wife has flung herself on his body. Apparently, the guard was the family's sole provider.
Anna asks if something can be done for the family.
We find out that he has given two hundred rubles to the widow.
The Vronskys leave.
As Anna and her brother leave, they hear people gossip about the death. Anna is visibly disturbed.
Anna asks her brother about Vronsky, but doesn't pursue the matter. Instead, she asks about his problems at home.
Oblonsky takes her to his house, and then goes off to the office.