ABS abbreviation.

ABS abbreviation.

• A. Automatic Braking System.
• B. Automatic Block System.
• C. Adaptive Block System.
• D. Automatic Boundary System.

Answer: (B)

ABS refers to signaling that uses fixed track sections called blocks and automatically controls train movement based on whether the next block is clear. The idea is to prevent two trains from occupying the same block at once and to maintain safe spacing by only allowing a train to enter a block that is clear, with signals reflecting that status. The appropriate expansion in this context is Automatic Block System, which describes this block-based automatic control of train movement. The other phrases describe different concepts—braking only, adaptive (dynamic) blocks, or boundary controls—which aren’t what ABS stands for in rail signaling.

ABS refers to signaling that uses fixed track sections called blocks and automatically controls train movement based on whether the next block is clear. The idea is to prevent two trains from occupying the same block at once and to maintain safe spacing by only allowing a train to enter a block that is clear, with signals reflecting that status. The appropriate expansion in this context is Automatic Block System, which describes this block-based automatic control of train movement. The other phrases describe different concepts—braking only, adaptive (dynamic) blocks, or boundary controls—which aren’t what ABS stands for in rail signaling.