Railway Signal

"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
History of railway signal:
  • 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
Type of railway signal:

Type of railway signal

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