Which code is used for Automatic Train Operation?

• A. ATPM
• B. ATS
• C. ASPS
• D. ZX

Answer: (A)

Automatic Train Operation refers to the system that drives a train automatically along a route, staying within safety limits set by the train protection system. In many railway signaling references, the code used to label the function that handles this automatic driving is ATPM, standing for Automatic Train Protection Module (the on-board or subsystem component that enables automatic operation with built-in protection). This naming distinguishes it from other functions: Automatic Train Supervision is about centralized monitoring and management rather than the on-train driving itself, and the other options aren’t standard codes for ATO.

So, ATPM is the best fit because it directlyDesignates the automated operation capability within the safety-protected framework, whereas the other choices correspond to different subsystems or are not recognized terms for ATO.