Which of the following actions would NOT be influenced by cab signals?

The action that would not be influenced by cab signals is related to engine temperature monitoring. Cab signals are primarily designed to provide real-time updates about the status of the train's movement, including speed restrictions, signal indications, and the direction of the train. These signals guide the engineer by indicating whether to proceed, reduce speed, or stop based on track conditions, signaling systems, and safety protocols. However, engine temperature monitoring is a separate aspect concerning the operational integrity and functionality of the locomotive itself. It is part of the engine's diagnostic systems and does not fall under the purview of cab signal systems, which focus on external train control signals rather than internal equipment performance.