The mighty veteran Purulia Express serving for decades, daily commuters' lifeline and witness to a Rising Bengal! - Soumyadip Mahato

Yes, most probably Naini has it's own signalling room. ALD is a very congested station, so it is quite possible that the signalling systems are not centralized there.
It is not a rule that all suburban stations have to be controlled from the main city. It is up to the railways to decide how to distribute the load.

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