What is a Movement Permit Form D used for?

The Movement Permit Form D is specifically used for movements or other purposes requiring its use. This form serves as a crucial tool within rail operations as it documents and tracks specific permissions needed for a variety of movements that do not necessarily fall under routine procedures. It ensures that appropriate authorizations are in place for operations such as switching, track work, or entering sections of track that may have specific restrictions or requirements.

In contrast, the other choices imply limitations or specific uses that don't encompass the broader applications of Form D. For instance, while it may facilitate authorization for movement, suggesting that it applies until further notice can be misleading, as the form is used for defined parameters rather than an indefinite period. Similarly, while speed restrictions are an important aspect of operations, they are not the primary function of Form D. Lastly, indicating that it is only for emergency situations would significantly narrow the scope of its utility and misrepresent its overall operational role.