Solid State Interlocking
More on solid state Electronics
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The implementation of logic for train operation is done using computers in solid state interlocking system. The Railway signaling follows simple logic to ensure safety is ensured. The computer system ensures that the logic required for ensuring safety is maintained when a train is signalled to move proceed beyond a signal.
The logic required for signaling is quite simple
a) Ensure that the portion after the signal being cleared and till the next signal is clear of any obstruction. The clearance of obstruction is proved by suitable means as track circuits or axle counters generally or it can even be manually done by switches etc.
b) Ensure that if any diversion is required then the portion of track which allows diversion ( normally referred as switch) is properly mechanically set and locked in the required direction of the movement of the train. The setting locking and detection of route is done by point machines.
c) Ensure that a adequate distance beyond the next signal is also set properly and is clear of any obstruction. This in effect means that the checks as in a) and b) above is required to be carried out for a adequate distance beyond the signal at which the train is supposed to stop after it is allowed to proceed beyond the signal being cleared.
d) See that if trains are running at high speed then there are no connected tracks from where rail vehicles can roll and collide with the train being signalled to move.
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