This morning, the important and highly followed iShares Dow Jones Transportation Average ETF (NYSEARCA:IYT) is trading lower by $1.84 to $91.52 a share. This is a 2.00 percent decline for the major transportation index. Traders and investors will usually follow the transport index very closely as a sign of economic growth and contraction.

This afternoon, the leading railroad stocks are declining lower. Traders and investors will look to the railroad stocks and the transportation stocks as an economic barometer. When this industry group declines or trades lower it is sign that things could be slowing down in the economy. The opposite is true when this sector rallies and trades higher, it is generally a sign of economic expansion.

This afternoon, the sell off in Apple Inc (NASDAQ:AAPL) is dominating the headlines. This is the steepest decline on the major stock market indexes that we have seen since in 2012. One industry group that is dropping sharply lower is the transportation stocks. The iShares Dow Jones Transportation Index ETF is trading lower by $2.13 to $92.12 a share.

CSX Corporation (NYSE:CSX) is a transportation supplier. The Company provides rail-based transportation services, including rail service and the transport of intermodal containers and trailers. CSX Corporation witnessed volume of 24.45 million shares during last trade however it holds an average trading capacity of 9.18 million shares.