Which of the following describes the characteristics of a section of track deemed as a heavy grade?

The defining characteristic of a heavy grade on a railroad track is an average grade of two percent or greater over a length of two continuous miles. This classification is crucial for determining the operational limits and requirements for trains that traverse this section of track. A heavy grade imposes greater demands on locomotives, requiring them to exert more power to maintain speed while adhering to safety protocols.

Understanding this definition is important for train crews as they plan for adequate braking distances and power needs. The two percent threshold indicates a significant incline, and because this percentage affects both the speed and control of the train, it is vital for train operators to be aware of such sections.

Other definitions and characteristics do not highlight the same continuous length or percentage gradient, making them less relevant when discussing the operational implications of heavy grades.