Final answer:
When instructed to leave an initial terminal without Train Documentation, it is usually by a safety officer or an official with emergency authority, to ensure immediate safety in an exceptional scenario.
Step-by-step explanation:
Regarding the situation where someone may instruct you to leave your initial terminal without Train Documentation, it typically involves scenarios where immediate safety concerns or emergency procedures are at stake. In the context of railroad operations, which seems to be implied by the term 'initial terminal', it's usually a designated safety officer or an official with comparable authority who can issue such an instruction.
Different railroad companies and transportation regulations may have specific protocols for this scenario. However, in the case of an emergency, the conductor or the engineer in charge, following their emergency training protocols, could order the move to ensure the safety of the crew, passengers, and the public. It's important to note that this action would be exceptional, and would normally require subsequent documentation and potentially an investigation, depending on the nature of the incident and the regulatory framework governing railway operations.