"Signal is a mechanical or electrical device erected beside a railway line to pass information relating to the state of the line ahead to train/engine drivers."
Purposes of railway signal:
- Indicate if the line ahead is clear (free of any obstruction) or blocked
- Confirm that switches/points are set in the correct direction
- Regulate the speed of the train to ensure safety
- Ensure safety of train and road traffic in level crossings
- Two policemen sent ahead on horseback
- Policemen placed at regular intervals to regulate movement of trains
- Mechanized signal first introduced in 1842
- Interlocking introduced in 1867
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