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What are the different levels or standards of interlocking that IR specifies for stations?

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What are the different levels or standards of interlocking that IR specifies for stations?

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There are three levels of interlocking used by IR. A Standard I interlocked station has mechanical interlocking. It also usually has just one running line and a loop line (and perhaps a couple of sidings). These are usually branch line stations. The points are worked by point levers situated near the points, and the signals are worked from interlocking frames in the signal cabin. The mechanisms use keys such that a key obtained from the points mechanism after setting the points must be used on the signal post locking mechanism to pull off the corresponding signal(s) and also to operate the block instrument. Through running speed for trains is restricted to 50km/h. A Standard II interlocked station may be mechanically or electrically interlocked (usually the latter). These are usually non-trunk main line stations. The main running line at such a station can be completely isolated from the loops and shunting sidings on both sides. In electrically interlocked systems, setting the points a

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