What type of move can be utilized when it is necessary to reposition cars to the opposite end of the engine?

The correct approach for repositioning cars to the opposite end of the engine is through a Gravity Switch. This technique involves allowing the cars to roll downhill due to gravity, which can effectively facilitate their movement to the specified location. In situations where cars need to be shifted without the direct application of power from the engine, a Gravity Switch leverages the natural slope of a track, making it an efficient method for car repositioning.

The other methods listed would not effectively achieve the goal of seamlessly shifting cars to the opposite end of the engine. Options that might typically employ either direct propulsion (like a Forward Push) or require additional setup (like a Track Switch) would not utilize the natural downward slope that a Gravity Switch depends upon. This makes the Gravity Switch the most practical solution for this operational requirement.