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In 1896, Dow Jones created the industrial average (with 12 stocks) and separated the railroad stocks into a separate average (renamed the transportation index in 1970); daily publication of the average began in the Wall Street Journal later that year. The industrial average expanded to 20 stocks (1916) and then 30 (1928); the average still lists 30 stocks, but the companies have changed through the years as American industry itself has grown and changed.
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