They are using a form of imagery in this phrase. The train carts are not literally ice cubes bobbing up and down. It's used to help the reader imagen the scenario. Always refur to a "sentance/quote" as a 'phrase'. And use things like further more and moreover to get yourself good grades. Good luck
The world that surrounds us today is a reflection of the technological progress that was achieved in the year 1984. Technology was revolutionizing itself and making its way into the homes of millions of Americans, never seizing to grow since.
