Which two items does line 3 inform TCs?

The correct answer emphasizes the importance of the communication provided by line 3 in ensuring safety and operational efficiency. In this context, line 3 delivers critical information indicating both the presence of equipment ahead and gives permission for the train crew (TC) to proceed past a stop signal.

Being informed of equipment ahead is vital for the train crew as it helps them anticipate any potential hazards, ensuring they can operate the train safely with the awareness of any other operational factors in their vicinity. The clearance to proceed past a stop signal is an essential directive that allows the train to move forward under specific conditions, which is crucial for maintaining flow in train operations while adhering to safety protocols.

This combination of information enables train crews to respond appropriately to their environment and execute their duties effectively, illustrating the role of line 3 as a pivotal communication point in railway operations. Other choices may present relevant information, but do not capture the specific dual elements provided by line 3 as accurately as this one.