ASPS stands for which term?

• A. Alarm Indication Relay
• B. Approach Lock Repeater Stick
• C. Always Reporting Block
• D. Automatic Train Supervision

Answer: (C)

ASPS is about a block that continuously communicates its status to the signaling system. The idea is that the block doesn’t just report once or occasionally; it keeps reporting occupancy, faults, and other conditions so the interlocking and central supervision always have up-to-date information. This steady flow of status data helps ensure safe routing decisions and enables rapid fault detection, since a block that stops reporting can trigger safety actions or a hold on operations.

Other terms refer to different concepts. Alarm Indication Relay denotes a device that signals a fault condition, not a block’s ongoing status. Approach Lock Repeater Stick isn’t a standard signaling term. Automatic Train Supervision describes a higher-level system that oversees train movements, not the specific notion of a block that always reports its status.

Therefore, the term that fits ASPS is Always Reporting Block.