Railcars are considered to be most stable when they are on their:

Railcars are considered to be most stable when they are on their wheels. This configuration allows them to properly distribute their weight and maintain balance while being used on tracks. The design of railcars ensures that when they are resting on their wheels, the center of gravity is optimally positioned, minimizing the risk of tipping or rolling over.

When railcars are on their side, end, or even in an elevated position, their stability is compromised. Laying on their side can lead to a situation where the weight is unevenly distributed, making it susceptible to further movement or collapse during rescue operations. Being on end may also create a dangerous scenario, as the car could easily be displaced or fall over if not adequately supported. Therefore, the proper orientation on their wheels is vital for maintaining safety and stability during rail operations and rescue scenarios.