Automatic block signaling (ABS) safeguards the train operations between
stations and an effective means of increasing the line capacity. In the color
light area, where the trains are worked on the ABS, each running rail is
divided into a series of blocks sections (track between the stations) and
station sections (track between entry and exit signal). Each section is track
circuited separately. Entry into each block section is governed by the automatic
block signals at the entry point of the section. (Signals 1, 2 and 3 in the
coming pages). The train leaving station block A and entering station block B
will be controlled by the controlled signals at respective stations. The color
light area has dual tracks and under normal operation the up trains will be
using up line and the down trains will be using the down line.
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