How is a train that has no designated schedule or bulletin referred to?

A train that has no designated schedule or bulletin is referred to as an "Extra Train." This term is used within the railroad industry to describe a train that operates outside of the regular schedule or established timetables. Unlike scheduled freight or passenger trains, Extra Trains can be arranged as needed, often to accommodate irregular situations such as additional cargo demands or service requirements. They require specific authority from dispatchers and must be communicated clearly to ensure safety and efficient operation.

In the context of the railroad system, Extra Trains play a crucial role in flexibility and responsiveness to freight or passenger service needs, allowing for adjustments in service that are not bound by rigid scheduling constraints. They may also encompass movements that do not fit existing classifications or necessitate immediate action, providing a valuable tool for railroad operations.