What is the definition of an articulated car in railroad terminology?

An articulated car in railroad terminology is defined as a permanently connected multiple unit car that shares a common truck. This design allows for greater flexibility and maneuverability on the tracks, as the shared truck supports multiple car bodies. This configuration is particularly beneficial in tight curves where traditional cars with separate trucks might struggle. The articulation enables smoother transitions and improves the overall dynamics of the train during operation.

In this context, it's essential to understand how the articulated design differs from conventional cars. For instance, single cars that rely on separate trucks lack the benefits of shared support, which can lead to more complexity in train handling. Additionally, while there are cars designed specifically for cargo transport and passenger cars that might include additional seating capacity, these definitions do not capture the structural and operational characteristics that define an articulated car. The focus on the permanent connection and common truck is what sets this choice apart and highlights the unique function these cars serve in the rail network.