What is the Automatic Block System (ABS) primarily used for?

The Automatic Block System (ABS) is primarily utilized as a series of consecutive blocks governed by signals. This system enables the safe and efficient movement of trains by providing an organized framework of blocks, where each block is a defined section of track. When a block is occupied by a train, signals indicate this status to prevent other trains from entering that block, thereby maintaining safe separation distances between trains.

The use of signals as part of the ABS is crucial because it directly influences the operations of train movements. With clearly defined signal indications, train crews can ascertain the status of blocks ahead and react accordingly, ensuring safe travel throughout the railway network. This system is particularly effective in areas where manual control is impractical and serves to enhance the overall reliability and safety of train operations.