During the Civil War, Vanderbilt donated his fleet's largest ship, aptly named the Vanderbilt, to the Union Navy. By 1864, he had retired from shipping, having amassed nearly $30 million in wealth. At age 70, Vanderbilt turned his attention more closely to railroads, acquiring the New York & Harlem and Hudson Line (which ran along the Erie Canal), and then going after the New York Central Railroad. In a ruthless act during a bitter winter when the Erie Canal was frozen over, he refused to accept Central’s passengers or freight, cutting them off from connections to western cities. Forced to capitulate, the Central Railroad sold Vanderbilt controlling interest, and he eventually consolidated his hold on rail traffic from New York City to Chicago. This new conglomerate revolutionized rail operations by standardizing procedures and timetables, increasing efficiency and decreasing travel and shipment times.