What is critical during a pre-departure train inspection?

During a pre-departure train inspection, ensuring all safety systems are operational and the train is in compliance with regulations is vital. This step is crucial because the safety of passengers, crew, and the integrity of the railway system depend on the functionality of various safety systems. These include brakes, signaling devices, emergency equipment, and communication systems. Compliance with regulations ensures that the train meets legal and operational standards, which can prevent accidents and ensure smooth operations.

While the other options might contribute to the overall passenger experience or operational efficiency, they do not have the same critical impact on safety. Passenger capacity is important for managing train occupancy but does not affect the immediate safety of the train. Testing Wi-Fi and entertainment systems may enhance passenger comfort but is secondary to ensuring that all safety measures are in place. Reviewing the departure timetable is necessary for scheduling but does not address the operational integrity of the train itself. Hence, focusing on safety systems during pre-departure inspections is paramount for the overall functionality and safety of train operations.