In Simon Sebag Montefiore's 2003 book, Stalin, The Court Of The Red Tsar, there's a single sentence reference to Nicholas' train, or at least some of its cars. It was stated that Stalin went to the Potsdam conference in defeated Germany in a heavily armored train that included four green cars from Nicholas' time that had been kept by the Soviets in a museum. Does anyone know anything about this, i.e., is it true?