The issue at DeKalb Av arises from an interlocking where the B, D, N, and Q trains cross paths after coming over the Manhattan Bridge. The merging of the B and D trains to join with the Q and N trains, respectively, can cause delays, as one train must wait for another to cross in front of it. “You’re on a D train, say, stopped, waiting for an N train on the other side of the bridge to pass to get to the switch in front of you.” The new technology will help clear the issue by allowing trains to run faster and closer together through the interlocking. The MTA plans to fix this by updating the switches in the interlocking and realigning the trains that run through it.