Although this is only a partial deinterline, moving the merge from Rogers Junction (33tph) to Utica (16tph in the IRT Capacity Study) would improve reliability a lot. Operations at Flatbush Av would be simpler too, since 2/5 trains currently have to wait for their specific terminal track
Untangling the Nostrand Junction is a decades-old idea that MTA recently floated in the most recent 20-Year Needs Assessment, and involves changing some track layout and terminal stations so that the 2/3/4/5 are no longer crossing each other near Nostrand Avenue future.mta.info/documents/20...

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