What does the triangle alongside the MAL bar indicate?

The triangle alongside the MAL (maximum allowable line speed) bar signifies the beginning of a slow speed order. This visual indication alerts train operators that they must reduce their speed to a specified limit soon after passing that point. Adhering to this signal is crucial for maintaining safety and ensuring compliance with operational procedures. The presence of a triangle serves as a clear communication tool to prevent overspeed incidents and enhance overall train handling, particularly in areas where track conditions or other operational factors necessitate a reduction in speed. This understanding is essential for engineers and conductors in maintaining safe and efficient train operations.