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Interlocking is the process used on real railways of applying logic to relate different devices (such as turnouts, signals and track circuits) on a layout together to control which devices can or cannot be changed and what settings they can be changed to. Its purpose is to ensure safety by preventing collisions by disallowing settings to be made which might cause a collision.
Traditionally, interlocking was implemented by mechanical locks in signal box lever frames and on turnouts.
In modern times, interlocking has been implemented as a combination of electronics hardware and more recently, computer control systems.

The SSI Model Railway Control System implements a fully integrated routing and interlocking system. To be able to provide prototypical route setting and control of a layout, Layout Control Software must be able to implement interlocking.
For a layout to be described as 'interlocked', there must be a mechanism in place which (a) ensures that only the correct signal for a route is pulled off and (b) that once a signal is pulled off to clear a route, that none of the devices (turnouts) within that route can be subsequently changed until the signal protecting the route is placed back at danger or the route is cancelled.

SSI enables the modeller to implement a fully computer controlled interlocking system. You do not have to perform any physical layout wiring other than for conventional turnout and signal motors/lights.
SSI does not limit the number of devices which can be interlocked.
Like the real railways, SSI implements interlocking using a simple purpose built scripting language which enables maximum flexibility and configuration of interlocking logic.

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