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What are modified non-interlocked (MNI) stations?

April 26, 2017mni modified non-interlocked stations

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What are modified non-interlocked (MNI) stations?

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Modified non-interlocked stations are those where setting and locking the points releases a key which has to be used to pull off a signal; however, the block instruments are operated independently. So there is some minimal amount of a safety lock between the points and the signals, but it does not qualify as full-fledged interlocking.