The Interstate Commerce Act is passed because of the ceaseless demand of public for the regulation of the railroads. The passing of the Act only serve as the government's response to such claims. The demand is caused by unfair used of these railroads by some private entities only.
To make things easier, i’m numbering the blocks starting in the top left going right and going back to the left for the next in line (so four is right underneath one)
command-2,7
mixed-3,4,6
market-1
traditional-5
hope this helps!