Before moving car(s) from a shop track, which of the following items must be checked?

The correct answer emphasizes the crucial safety measures necessary before moving any car(s) from a shop track. Checking blue flags or lamps is essential because these serve as visual indicators to communicate that work is ongoing in the area and that the track is not clear for movement. Tools need to be accounted for as they might pose safety hazards if left on the track. Additionally, verifying the condition of the brakes is vital to ensure that the cars can be operated safely and effectively, reducing the risk of accidents during movement. This comprehensive approach to safety helps maintain a secure work environment for both personnel and equipment.

The other options suggest important checks but do not encompass the critical components needed prior to the movement of cars. While personnel presence and tool removal is certainly important, it is not as comprehensive as the items listed in the correct answer. Compartment and knife switch checks, as well as verifying angle cocks and wall trolley connections, may also be relevant in specific contexts but do not cover the broad safety essentials required for car movements from shop tracks.