You are looking at a chart that shows the weight (in tones) of domestic shipments.
As you can guess… nationally, trucks drive the majority of the shipments.
After that you are looking at rail.
Then the weight of oil brings pipelines into third place.
Followed closely by water (think great lakes and Mississippi.)
The rail intermodal is part train part truck… and lastly is air. Air is expensive, so it does not get as much weight.
Looking at the 2015 forecast…
You can see that rail intermodal and truck will increase, while the others will decrease 9in percent share).