The to 168 St GO was because 8 Av was closed, and the all had to run via 6 Av, with the all sharing the local track between 34 St and W 4 St. The ran via Broadway to Whitehall St. Since the was needed on 6 Av due to the train work, and 3 routes were needed on CPW, they combined the and into the to 168’St and the had to run local in Brooklyn to make room. No more than 15-17 TPH on a single track on weekends.