What is the primary reason for train operators to coast as much as possible?

Coasting is a technique used by train operators to allow the train to continue moving forward without actively applying power. The primary reason for this practice is to reduce power consumption. When a train coasts, it relies on its momentum to maintain speed, which means the operator is not using the locomotive's engines to power the train. This approach can lead to significant energy savings, as the train utilizes the energy already expended to maintain movement rather than consuming additional fuel or electricity unnecessarily.

Additionally, while coasting can also have benefits such as maintaining passenger comfort by providing a smoother ride and possibly reducing wear on mechanical components over time, these are secondary advantages compared to the primary goal of conserving energy. Reducing power consumption not only decreases operational costs but also minimizes the environmental impact, which is increasingly important in the context of sustainable transportation.