My total guess not based on the drawings - the wheels of the cars move with a certain delay as a reaction to its tow bar getting turned. I would assume this delay can be configured on a per-car basis because the cars farther back may require more compensation than the ones in the front.

Although I am calling it a delay, I assume the mechanism is mechanical and there is probably a better word to describe the action where the wheels do not turn at the same time or with the same severity as the tow bar.