On the evening of May 5, 1923, everything seemed quiet on the Blue Express , China's luxury railway line connecting Tianjin and Pukou . The train, recently purchased by the Chinese Railway Administration from an American company, boasted Asia's first all-steel coaches. Its first class carriages consisted of compartments which, on that day, were filled not only by Chinese, but also by foreign passengers of various nationalities, some of them businessmen or long-term residents of China , others, using a modern word, 'tourists'. Among the passengers were Miss Lucy Aldrich , the sister-in-law of John D. Rockefeller, Jr . and daughter of Senator Nelson Aldrich of Rhode Island; two officers of the US Army, Major Allen and Major Pinger; Angelo Musso , a wealthy Italian lawyer based in Shanghai and an early supporter of Benito Mussolini's Fascists; he was accompanied by his private secretary, the young Alba Coralli. There was a Mexican industrialist with his wife, on