What is required before a train can enter Track Bulletin Form B limits from any location other than the start?

Before a train can enter Track Bulletin Form B limits from any location other than the start, it is essential to obtain permission from the employee in charge. This procedure ensures safety and coordination when operating within designated limits that may have specific restrictions or work being conducted on the track. The employee in charge, usually responsible for the maintenance of the track and ensuring safety protocols are followed, must grant permission to confirm that it is safe for the train to proceed. This step is critical for maintaining safe operations and preventing unauthorized access to potentially hazardous areas of track. Other choices imply actions that either lack direct responsibility or don't adhere to the necessary clearance protocols established for safe train movement.