What signifies a "Movement Authority" in a train operation context?

A "Movement Authority" is a critical aspect of train operations, as it represents explicit permission granted by the dispatcher or signaling system to a train crew, allowing them to operate on a specific section of track. This authorization ensures that all movements are safe and coordinated, preventing collisions and maintaining the efficiency of train schedules. Movement Authority is integral to the safe and regulated flow of rail traffic, as it includes necessary details regarding the route, limits, and any pertinent conditions that may affect the operation.

The other choices do not align with the definition of Movement Authority. A scheduled timetable focuses on arrival and departure times rather than granting permission to proceed on the tracks. Weight limits pertain to the physical capacity of the track structure and do not involve operational authorization. A warning to stop is a signal indicating an immediate action, which is contrary to the nature of Movement Authority, as it denotes permission to continue.