As Wall Street hits highs, some investors await transport catch-up

With the Dow industrials and S&P 500 indexes setting new all-time records in the past month, some investors are waiting for a key group of transportation stocks to hit fresh highs as well before becoming more confident the rally will keep chugging along. Long seen as a barometer of the U.S. economy, the Dow Jones transport average is closely watched as part of the "Dow Theory," which tracks performance of both the industrials and the transports to confirm major trends in the stock market. Th