Which marking is correct for the center of balance on rolling stock?

The correct marking for the center of balance on rolling stock is vital for ensuring safe handling and transport. The option that describes the marking as "GW 24, 250, C/B 183" F.F.E, arrow" indicates crucial information about the weight (Gross Weight), which is 24,000 pounds, and specifies the center of balance measurement at 183 inches from the front of the equipment.

This option correctly adheres to the standard format for denoting weight and center of balance. By having the center of balance measurement prominently marked, it helps ensure that those handling the rolling stock can properly load and secure the equipment to maintain stability during transport. Understanding the implications of these measurements is critical for air freight operations to avoid potential mishaps related to weight distribution.

In contrast, the other choices either list incorrect gross weights or center of balance measurements that do not conform to standard operational guidelines, making them unsuitable.