What is the aspect preceding a block limit signal?

The aspect preceding a block limit signal is typically the Approach Block Limit aspect. This is because an Approach Block Limit signal indicates to the train crew that they are approaching a block limit and need to be prepared to stop at the next signal, which may be a Stop Signal or a similar indication. The Approach Block Limit signal serves as a warning to ensure that the train is under control as it nears the limit of the block, promoting safety and preventing potential collisions or other incidents.

In the context of rail operations, this aspect gives the crew time to make necessary adjustments, such as reducing speed, ensuring that they are fully prepared to respond to the upcoming signal. Understanding this aspect's role is crucial in maintaining safety and operational efficiency on the railroad.