Anna Karenina's ending is less a puzzle to decode and more this profound, gutting culmination of all the forces Tolstoy sets in motion. Anna's final moments on the train tracks aren't a sudden madness; it's the logical endpoint of a woman systematically stripped of everything that gave her life meaning—her son, her social standing, even Vronsky's undivided attention. The prose in that section, with its almost hallucinatory focus on the wheel and the candle, makes you feel trapped inside her fractured consciousness. It's horrifying, but it's not meant to be a simple moral judgment.
Contrast that with Levin's parallel journey. While Anna seeks meaning in passionate, external love and destroys herself when it fails, Levin is literally mucking about in the fields with peasants, grappling with faith and his place in the world. His existential crisis is resolved not with a grand romantic gesture, but with a quiet, personal acceptance of goodness and family. 'I shall go on in the same way, losing my temper... but still my life now... is not only not meaningless, but has the unquestionable meaning of the good which it is in my power to put into it!' That line always gets me. It's the anti-Anna arc.
So the 'explanation' is really in that juxtaposition. One path, consumed by selfish passion and societal pressure, leads to annihilation. The other, messy and philosophical and grounded in daily work and love, leads toward a shaky but real peace. Tolstoy isn't giving you one answer about life; he's showing two极端 possibilities. The railway, which first brought Anna and Vronsky together, ultimately destroys her. Levin finds his answer not in the city or on a train, but on his own estate, under the sky.