What is NOT a requirement for maintaining a written or electronic record in the cab of the locomotive?

Recording the number of crew members in the cab of the locomotive is not a requirement for maintaining a written or electronic record. This is because operational and safety protocols focus more on track and vehicle safety, including the condition of the train and its components, rather than the personnel onboard.

On the other hand, details such as the location of brake tests, the location of cars with inoperative brakes, and the total weight and train length are critical for ensuring safe train operation. These records play a vital role in addressing potential safety hazards and compliance with regulations. Tracking brake test locations helps ensure that all necessary safety checks have been completed. Recording the location of cars with inoperative brakes is essential for identifying and managing defective equipment. Additionally, knowing the total weight and train length is crucial for safe train handling and operational protocols, impacting how the train operates within different terrains and conditions.