What does a triangle alongside the MAL bar indicate?

A triangle alongside the MAL (Movement Authority Limit) bar signifies the beginning of a slow speed order or a work zone. This indication is crucial for train engineers as it alerts them to reduce speed in preparation for conditions that may require greater caution, such as track work, maintenance activities, or changes in the operational environment. Recognizing this signal is important to ensure safety and compliance with operational protocols in these areas, where regular speeds may not be appropriate due to potential obstacles or hazards on the tracks.

This understanding helps train operators maintain safe operational practices, especially in environments where the train's handling characteristics and stopping distances are affected by reduced speeds.