What is a key characteristic of multiple-unit cars in train operations?

A key characteristic of multiple-unit cars in train operations is their capability to be coupled with or without cars displaying a marker. This flexibility allows multiple-unit cars to operate seamlessly within a train consist, whether they are connected to other cars or running individually.

Multiple-unit cars are designed to communicate with each other and can be powered by their onboard engines, making them particularly versatile. The ability to operate without needing a traditional link to a locomotive or requiring additional marker cars enhances operational efficiency in various rail systems. Such systems can adapt to different configurations based on service needs without being constrained by the necessity of having specific markers.

This characteristic distinguishes multiple-unit cars from standard railcars, where coupling and marker requirements are more rigid and dependent on conventional locomotives.