What are fixed signals of an interlocking referred to as?

Fixed signals of an interlocking are referred to as interlocking signals because they are specifically designed to manage train movements at junctions or points where different tracks converge or diverge. These signals provide critical information to locomotive engineers regarding the status of the tracks ahead, indicating whether they are safe for trains to proceed or if they must stop or take cautionary measures.

Interlocking signals are part of a complex signaling system that ensures safe and efficient train operations. They operate in conjunction with mechanical or electronic interlocking systems that prevent conflicting movements. In contrast, while block limits define the sections of track that trains are allowed to occupy, control points are locations where trains can be held or redirected, and general orders pertain to instructions provided to train crews that are not related to fixed signals. Thus, the term 'interlocking signals' is the most accurate description for fixed signals within an interlocking system.