Which two indicating lights must be illuminated for the train to take power?

For a train to safely take power, the illumination of the brake release light and door closed light is crucial. The brake release light confirms that the train's air brake system is fully released, ensuring that the train is ready for movement without unintended stops. This is important for the safety and reliability of the train operation, as any residual braking force could cause issues during powering up or initial movement.

The door closed light indicates that all doors on the train are securely closed and locked. This is vital for passenger safety, as doors that are open or not properly secured could pose a serious risk during travel.

Together, these two indicators ensure that the environment within the train is safe for operation, both for the crew and passengers. If either of these lights is not illuminated, it may indicate a potential hazard that needs addressing before the train can be powered up.